Pest scouting · sticky cards · IPM · not a kit

How to scout pests in a high tunnel: yellow vs blue sticky cards, weekly walks, and IPM (sourced)

Growers search high tunnel pest control, high tunnel IPM, sticky cards, and high tunnel aphids when the film keeps rain off and the house stays warm. This page is the scouting sibling — weekly walks, a 10× hand lens, yellow versus blue sticky cards, plant inspections, biological control and banker / trap plants, and OMRI-listed options in general terms with the label-is-the-law caveat. Exclusion mesh and SWD ratings stay on high-tunnel insect netting. Heat and humidity that drive mites stay on ventilation fans and temperature monitoring. Weeds as a reservoir stay on ground cover / weed barrier. It is not a commercially manufactured high-tunnel kit and not a USDA payment schedule.

Quotes copied 22 October 2026, about 03:30 UTC from live Penn State Sánchez / Sullivan / Skinner, Purdue Foster and Ingwell, Maryland Brust, UMass greenhouse BMP and Vegetable Notes, USU aphid / caterpillar / strawberry IPM pages, SDSU Njue, UKY ID-235, UMN/SARE, Alabama Extension OMRI notes, UF/IFAS CV295, the High Tunnel System Initiative FAQ, Pennsylvania seasonal high tunnel, and CPS 325. Featured Amazon prices copied the same night. A missing featured price stays an em dash. Ratings are not copied. Seller greenhouse or houseplant lines stay labeled seller claims. This page does not invent a USDA dollar, a spray rate, or a beneficial release count.

Kit index: commercially manufactured kits. Replacement-parts directory: high-tunnel replacement parts. Insect netting (exclusion mesh, not scouting): high-tunnel insect netting. Fans: HAF / exhaust / thermostats. Thermometers: temperature monitoring. Weeds: ground cover / weed barrier. Size map: high-tunnel sizes. County inspection: EQIP checklist. What the program will not pay for: EQIP will not pay for. Affiliate method: about / disclosure.

Why a tunnel changes pest pressure

Rain does not wash small insects off the crop under plastic. Winters stay warm enough that some mites survive inside. Hot, dry days favor spider mites. Those are extension sentences, not house rules.

Aphids are a very common problem in high tunnels because the covering excludes rainfall, which is a major mortality factor for small insects like aphids.

Source: Foster and Ingwell, Purdue University Vegetable Crops Hotline — Aphids in High Tunnels (8 June 2016, Issue 614). Purdue names tomato, pepper, and cucumber outbreaks in that same note.

The warm, dry conditions in a high tunnel favor rapid mite development and reproduction, which enables them to complete a generation in as little as 5-7 days which could lead to a 50X increase in the population in just one week.

Source: Brust, University of Maryland Extension — Two Spotted Spider Mites on High Tunnel Vegetables (updated 23 October 2024). The 5–7 day generation and “50X increase … in just one week” are UMD’s sentences. Do not turn them into a Tunnel Spec multiplier. Same-night UMass Vegetable Notes: TSSM are favored by hot, dry, and dusty conditions, which also aggravate mite injury by stressing the plant. Winter survival: All life stages can survive the winter in high tunnels in New England, and adult females will overwinter outside as well. Source: UMass Extension Vegetable Notes — Two-spotted spider mites in solanaceous crops (28 July 2022 issue PDF, opened 22 October 2026).

Weekly scouting and a 10× hand lens

Scouting for insect and mite pests and their natural enemies in high tunnels is the cornerstone for successful integrated pest management (IPM). When starting out, you might want to scout each tunnel once a week. With experience, you may change the frequency. More frequent scouting should be conducted when transplants are set or when seedlings emerge.

Source: Sánchez, Sullivan, and Skinner, Penn State Extension — High Tunnel Vegetable Crops: Designing a Scouting Plan (updated 16 December 2025). Hand lens: A 10X magnification is sufficient for seeing most small insects. When using a hand lens, to focus, place the hand lens close to your eye (start off with a finger width) and move your head and the hand lens close to the item you wish to magnify. Plant counts: A starting point is to scout 1 plant in each 20 feet long section of row, which equals 5 plants in a 100 feet long row, for spring and summer crops including tomato, pepper, eggplant, and cucumber. Start out scouting 2 plants in each 20 feet long section of row or 10 in a 100 feet long row for leafy greens. Tap over white paper: Tapping plants, especially flowering plants, over a laminated white sheet of paper is a quick method for dislodging insects from blossoms or foliage. This is particularly effective for thrips that tend to hide within the blossoms. Record the walk: Record keeping is strongly recommended to keep track of when pest outbreaks occur, pests are attacked by natural enemies and to assess the effectiveness of a treatment.

Monitoring for aphids should happen weekly throughout the season, from the seedling stage through harvest. Use a 10-20x hand lens for species identification (Fig. 8).

Source: Volesky and Schumm, Utah State University Extension — High Tunnel Pest Management: Aphids (March 2021). Inspect transplants before they come in: Inspect transplants for aphids before bringing them into the high tunnel. UMass greenhouse BMP lens range: Use a 10X, 5X or 20X hand lens to facilitate observation. Source: UMass Extension Greenhouse Floriculture — Greenhouse Best Management Practices BMP Manual: Integrated Pest Management. SDSU when using biocontrol: When using biological control it is important to inspect or monitor your plants at least twice a week to detect the pest early before they reach damaging levels.

Yellow versus blue sticky cards

Cards catch flying adults. They do not replace turning leaves. Hang them in or just above the canopy, raise them as the crop grows, change them weekly, and write the count down.

Common colors for sticky cards are yellow and blue; with yellow being attractive to most insects and blue to thrips. Sticky cards are useful for determining the presence of flying insects. They can be used to capture thrips, winged aphids, whiteflies, fungus gnats, cucumber beetles, flea beetles, hover flies, parasitic wasps, and more. Sticky cards can be placed within or just above the crop canopy. They can be secured to bamboo stakes with binder clips. Start out placing 1 sticky card per 100 feet of row and adapt the number of cards to your situation.

Source: Sánchez, Sullivan, and Skinner, Penn State Extension — High Tunnel Vegetable Crops: Designing a Scouting Plan (updated 16 December 2025). Do not wait on winged aphids: It's important not rely only on sticky cards for monitoring. Insects, such as aphids, show up on cards after they developed wings, commonly in response to overcrowding on an infested plant. By the time they appear on cards, it may be too late, indicating a severe infestation on the crop.

Yellow sticky cards are commonly used in greenhouses to monitor winged pest populations. These cards capture adult whiteflies, thrips, fungus gnats, shore flies, leafminers, and winged aphids. Mites, mealybugs, scales, and non-winged aphids do not fly, so they are not captured on sticky cards. Use clothespins and stakes to vertically attach sticky cards just above (4–6″ or 10–15 cm.) the crop canopy. As plants increase in height, move the sticky card upward (vertically) on the stake. Blue sticky cards are also attractive to thrips (and even shore flies) and may be used to detect low thrips populations on susceptible crops (e.g., impatiens and begonias). However, thrips and other insect pests captured on yellow sticky cards are easier to observe than on blue sticky cards.

Source: UMass Extension Greenhouse Floriculture — Greenhouse Best Management Practices BMP Manual: Integrated Pest Management. Density on that greenhouse page: Use approximately 3–4 cards per 1,000 ft², or a minimum of one card per 1,000 ft², with additional cards placed near openings such as doors, vents, and sidewalls. Change and record: Change the cards weekly, and place new cards in the same areas of the greenhouse to track pest trends. Identify and record pest numbers. Over time, population trends will emerge and provide direction for your pest management program. USU height for winged aphids: Yellow sticky traps are effective to monitor for the presence of winged aphids. Place traps 4–6 inches above susceptible host plants (Fig. 10). UKY: To monitor, use yellow sticky cards hung just above crop canopies (a minimum of four per high tunnel) and/or tap plant parts over white paper to inspect for thrips. Eliminate weeds in and around structures. Source: University of Kentucky — An IPM Scouting Guide for Common Problems of High Tunnel and Greenhouse Vegetable Crops in Kentucky (ID-235 PDF opened 22 October 2026). SDSU: Sticky cards should be positioned just above the plant and raised as the crop grows.

PSU’s 1 card / 100 ft of row, UMass’s 3–4 cards / 1,000 ft², and UKY’s minimum of four per high tunnel are three starting points from three pages. Do not average them into a house takeoff.

Aphids, whiteflies, thrips, mites, caterpillars, slugs

Turn leaves. Look for honeydew, cast skins, silvery thrips scars, mite stipple, chewed holes, and slime. Cards miss wingless aphids and mites.

Examine at least 10% of the crop, checking the random interior and edges of the high tunnel. Shake a portion of the plant over paper or cardboard to dislodge any larvae. Scout plantings for eggs and larvae on the undersides of leaves, especially on the innermost leaves.

Source: Utah State University Extension — High Tunnel Management: Caterpillars (PDF opened 22 October 2026). Young caterpillars: Bacillus thuringiensis (Bt) products can effectively control young armyworm and cutworm larvae. UKY moths and Bt compatibility: Use screens over ventilation windows to prevent moth entry. Avoid placing security lights, which can attract moths, near structure entrances or windows. Sprays using Bacillus thuringiensis to control caterpillars are compatible with biological control methods. Exclusion screens are the insect-netting page — do not copy SWD 80-gram ratings here.

Monitor by trapping (shelter traps or pits) Action Threshold: 3-5 slugs per trap. Remove debris in high tunnel, lower humidity levels, and hand removal. Insecticides: iron phosphate or metaldehyde bait.

Source: Utah State University Extension — Defending the Castle: Integrated Pest Management in High Tunnel Strawberries (PDF opened 22 October 2026). That 3–5 slugs-per-trap line is USU’s strawberry high-tunnel table, not a Tunnel Spec threshold. Iron-phosphate or metaldehyde bait is named there — still follow the label. Debris and humidity sit with ground cover and ventilation.

Biological control and banker / trap plants

Some growers are interested in using biological control in their high tunnels because the ability to contain natural enemies within the tunnels increases the likelihood of achieving control. Based on our experience, we believe that lacewing larvae hold the greatest promise for successful biological control of aphids in high tunnels. Because they don’t fly, they are less likely to leave the high tunnel than many other biological control agents.

Source: Foster and Ingwell, Purdue University Vegetable Crops Hotline — Aphids in High Tunnels (8 June 2016, Issue 614).

Avoid the use of pesticides in the high tunnel when using biological control because most are toxic to the beneficial organisms. Check to make sure that the biological control organism is permitted for use in the state.

Source: Njue, SDSU Extension — Biological Control of Pests in High Tunnels (updated 1 April 2019). SDSU names Aphidius wasps and lady beetles for aphids; P. persimilis and N. californicus for spider mites; Orius and N. cucumeris / A. swirskii for thrips; Encarsia / Eretmocerus for whiteflies. Release rates stay with the supplier.

Phytoseiulus persimilis, a highly specialized predator mite, works best at a temperature of 65 to 80 degrees F and a relative humidity of at least 60 percent.

Source: UMN / SARE — Sustainable Pest Management in Greenhouses and High Tunnels (PDF opened 22 October 2026). Scout weekly: Prevent spider mite outbreaks by scouting weekly and releasing natural enemies as needed. UMD on greenhouse versus high-tunnel predatory mites: Biological control of TSSMs with predatory mites is used successfully in greenhouse tomato and cucumber production. But we currently do not have a great deal of information about these predatory mites being effective in high tunnel situations.

Yellow marigolds are a great way to detect thrips and sometimes spider mites. They are particularly useful early in the season when they are the only plant flowering. Bush beans are commonly used as a trap plant for spider mites. Spider mites tend to infest plants near tunnel edges and structures where they may have overwintered. Placing bean plant around those structures, helps detect them early, before they become a problem. Habitat plants, such as alyssum, are a great way to promote the establishment of natural enemies and encourage them to come inside high tunnels. They provide pollen and nectars to parasitic wasps and syrphid flies.

Source: Sánchez, Sullivan, and Skinner, Penn State Extension — High Tunnel Vegetable Crops: Designing a Scouting Plan (updated 16 December 2025). Those are trap / indicator / habitat plants, not a cash-crop mix.

OMRI-listed options — general terms, label is the law

This page does not print a rate, a PHI, or a spray day. Classes named on fetched extension pages stay classes.

Organic insecticidal formulations approved by OMRI must be applied in the recommended manner. Producers must read the insecticide label before use; the label is the law.

Source: Majumdar, East, Reeves, McQueen, and Chambliss, Alabama Cooperative Extension — Proper Use of Approved Insecticides in Organic Farming Systems (19 April 2021). Classes named on that page: They include kaolin clay (mineral particle film), pyrethrum (botanical), synthetic and natural oils, neem (azadirachtin, neem oil, neem soap), Bacillus thuringiensis (Bt), and spinosad (microbial derivative). UMN/SARE: Before using pesticides, read and follow label directions, and consult the Agricultural Use Requirements section for Personal Protective Equipment (PPE) and Restricted Entry Intervals (REIs). USU: When using insecticides inside a high tunnel, always read the product label to ensure use is permitted in enclosed structures like greenhouses or high tunnels. UMD classification: Some states consider a high tunnel the equivalent of a greenhouse for pesticide use, be sure you know how your state classifies high tunnels. Purdue crop label: Be sure to confirm that the product you choose is labeled for your particular crop. UMD soaps/oils if early: Using insecticidal soaps or horticultural oils can work very well if mites are caught early before populations build and severe damage occurs. Thorough coverage of the foliage is critical if the oils are to work.

Agree WG, Xentari (Bacillus thuringiensis subspecies aizawai) … OMRI-Listed: Yes … Can be used in greenhouse. Biobit HP, Deliver, DiPel DF, Javelin WG (Bacillus thuringiensis subspecies kurstaki) … OMRI-Listed: Yes … Can be used in greenhouse. Aza-Direct (azadirachtin) … OMRI-Listed: Yes … Antifeedant, repellant, IGR (insect growth regulator).

Source: Lahiri, UF/IFAS — Chapter 19. Biopesticides and Alternative Disease and Pest Management Products (CV295). Those are table rows on a biopesticide chapter, not a shopping list and not a high-tunnel calendar.

How this page sits next to netting, fans, ground cover, and thermometers

Insect netting owns exclusion mesh, SWD 80-gram language, and HTPE shade moth screens. This page does not reprint those mesh numbers. Ventilation fans own HAF, exhaust, and the heat/humidity that UMD and UMass say favor mites. Temperature monitoring is where you record the canopy numbers that go with a scout sheet. Ground cover is the weed-reservoir job UKY names when it says eliminate weeds in and around structures.

Sourced Amazon scout parts

Titles and featured one-time prices were copied from live amazon.com product pages 22 October 2026, about 03:30 UTC. Kit frames stay on manufacturer product pages. Skipped tonight: B0GR1FD2K2 Tanglefoot 5×7 20-pack (no featured one-time); B0DNRNLVK7 Gardner monitor cards (page did not resolve); B07QTYZZKW APIPI 10× lens (unavailable / no featured); B01142AU5M Peak 10× loupe (unavailable); B00A0EIZZS and B01CZWVIP6 Bausch + Lomb 10× (unavailable / no featured); B000E28UQU Chapin 20000 (no featured); B08MYQ2F8W Kensizer yellow cards (page did not resolve); B07TXGCNG5 Negarly yellow cards (HTTP 404). No pesticide SKU was opened for a featured price — rates stay on the label.

EQIP pays for the structure, not the cards

Sticky cards, a hand lens, a sprayer, beneficials, banker plants, and sprays sit outside the High Tunnel System Initiative payment. Confirm with your NRCS district conservationist. Tunnel Spec does not invent a dollar.

Under the High Tunnel System Initiative, financial assistance is provided only for the structure itself. Electricity, venting systems, lighting, etc. can be installed providing the additions meets manufacturer’s designs and specifications. However, the grower is responsible for those costs.

Source: USDA NRCS High Tunnel System Initiative FAQ (Updated November 2024; Oregon-branded). That PDF is silent on sticky cards, hand lenses, beneficial insects, banker plants, and OMRI-listed sprays.

Producers can install heating, ventilation, or electrical systems at their own expense.

Source: USDA NRCS Pennsylvania — Seasonal High Tunnel System for Crops. One state office page, not a national pest-supply payment. More exclusions: what EQIP will not pay for.

Consider additional conservation practices where appropriate to include: crop rotation; irrigation water management; salinity management; nutrient management; integrated pest management; critical area planting; mulching; roof runoff structure; diversion; underground outlets; heavy use protection; cover crop.

Source: NRCS Conservation Practice Standard 325 High Tunnel System. Integrated pest management is on that consideration list. It is not a sticky-card or beneficial-insect payment.

Rules vary; call your county NRCS office.

FAQ

Does EQIP pay for high-tunnel pest supplies?

The High Tunnel System Initiative FAQ says financial assistance is provided only for the structure itself; the grower is responsible for electricity, venting, lighting, and similar additions. Sticky cards, a hand lens, sprayers, beneficial insects, banker plants, and OMRI-listed sprays sit with those grower costs. Pennsylvania’s seasonal high-tunnel page says producers can install heating, ventilation, or electrical systems at their own expense — same structure-only split. CPS 325 lists integrated pest management as a complementary consideration, not a pest-supply payment. This page does not invent a payment dollar. Confirm with your county NRCS office. See what EQIP will not pay for.

Yellow or blue sticky cards in a high tunnel?

Penn State: yellow is attractive to most insects; blue to thrips; hang within or just above the canopy; start with 1 card per 100 feet of row; do not rely on cards alone — aphids often wing only after overcrowding. UMass greenhouse BMP: yellow cards catch adult whiteflies, thrips, fungus gnats, shore flies, leafminers, and winged aphids; mites, mealybugs, scales, and non-winged aphids are not captured; hang just above the canopy (4–6 in); blue is also attractive to thrips but yellow is easier to count; change weekly and record. USU: yellow cards 4–6 in above the host for winged aphids. UKY: yellow cards just above the canopy, minimum four per high tunnel, and/or tap over white paper for thrips. Cards monitor flying adults. They are not a spray schedule.

How often should I scout a high tunnel?

Penn State: start weekly; more often at transplant or seedling emergence; later every other week can suffice until plants come out. USU aphids: weekly from seedling through harvest. SDSU: at least twice a week when you are using biological control. UMass: change sticky cards weekly and record numbers. USU caterpillars: inspect at least 10 percent of the crop, edges and interior. Penn State plant counts: 1 plant / 20 ft (5 / 100 ft) for tomato, pepper, eggplant, cucumber; 2 / 20 ft (10 / 100 ft) for leafy greens. Carry a 10× hand lens. Record date, crop, pest, natural enemies, and a damage note.

Why do high tunnels change pest pressure?

Purdue: the covering excludes rainfall, a major mortality factor for small insects such as aphids. UMD: warm, dry high-tunnel conditions favor two-spotted spider mites — a generation in 5–7 days and UMD’s own “50X increase … in just one week” sentence (that multiplier is UMD’s, not a Tunnel Spec rate). UMass Vegetable Notes: TSSM favored by hot, dry, dusty conditions; all life stages can survive the winter in high tunnels in New England. USU: the protected, season-extended environment is also favorable for aphids. Exclusion mesh and SWD ratings stay on high-tunnel insect netting. Heat and humidity that drive mites stay on ventilation fans and temperature monitoring. Weeds as a reservoir stay on ground cover.

What biological controls do extension pages name?

Purdue: lacewing larvae for high-tunnel aphids because they do not fly out as readily. SDSU: Aphidius wasps and lady beetles for aphids; Phytoseiulus persimilis and Neoseiulus californicus for spider mites; Orius and N. cucumeris / A. swirskii for thrips; Encarsia / Eretmocerus for whiteflies; inspect twice a week; raise sticky cards with the crop; avoid most pesticides while using biocontrol; confirm the organism is permitted in your state. UMN/SARE: P. persimilis works best at 65–80°F and RH at least 60%. UMD: predatory mites are used successfully in greenhouses, but Maryland currently does not have a great deal of information about those mites in high tunnels. Penn State: yellow marigolds as thrips/mite indicators; bush beans at tunnel edges for mites; alyssum as habitat for parasitoids and syrphids. Release rates stay with the supplier — this page does not invent one.

Can I spray OMRI-listed products in a high tunnel?

In general terms only. Alabama Extension: OMRI-approved formulations still require the label; the label is the law. That page names kaolin, pyrethrum, oils, neem/azadirachtin, Bt, and spinosad as common OMRI-listed classes — not a spray recipe. UF/IFAS CV295 marks several Bt and azadirachtin products OMRI-listed and notes some can be used in a greenhouse. UMN/SARE: read and follow the label, including PPE and REI. USU and UMD: some states treat a high tunnel as a greenhouse for pesticide use — check how your state classifies the structure. Purdue: confirm the product is labeled for your crop. This page does not print rates, PHI, or a calendar. Exclusion netting is a different job and stays on high-tunnel insect netting.

Rules vary; call your county NRCS office. Tunnel Spec does not determine eligibility, payment rates, or inspection outcomes. Confirm pesticide and beneficial-organism labels with your state and your supplier. Not a spray schedule. As an Amazon Associate, we earn from qualifying purchases.