Successful pest monitoring is a meticulous, painstaking task. Still, it’s important to maintain thorough and organized scouting efforts as part of your overall pest control strategy. Raymond Cloyd, a professor and extension specialist in horticultural entomology/plant protection in the Department of Entomology at Kansas State University, says scouting can reduce outbreaks during the growing season and enhance the effectiveness of timing insecticide applications and releases of natural enemies.His research and extension program involves plant protection in greenhouses, nurseries, landscapes, conservatories and vegetables and fruits. He recommends growers implement these seven strategies.
1. Start early.
Place colored (yellow or blue) sticky cards among crops as soon as possible in the spring and conduct visual inspections, which will help to avoid outbreaks. Check the sticky cards once per week, count the numbers of insect pests and record the number detected on sticky cards and plants.
2. Position colored sticky cards appropriately.
In order to capture adult thrips (western flower thrips), whiteflies, shore flies and leafminers, place sticky cards just above the crop canopy, and attach to a bamboo stake with a clothespin, thus allowing the sticky card to be adjusted as the crop increases in height. However, in order to effectively capture adult fungus gnats, position yellow sticky cards horizontally near the growing medium surface, as this is where adults are most active. Yellow sticky cards can also be placed on the rims of containers and flats. One side of a sticky card can be utilized for one week, leaving the waxy protective paper on the unused side of the sticky card for the second week, which allows for one sticky card to be used for two weeks.
3. Place sticky cards underneath benches with soil-based or gravel flooring.
Position yellow or blue sticky cards, or yellow sticky tape underneath benches to help capture and detect the presence of adult thrips, fungus gnats and shore flies, which will aid in determining if these insect pests are, or have pupated in the gravel or soil.
4. Visually inspect plants.
Sticky cards (yellow or blue) will capture adult thrips (western flower thrips), whiteflies, fungus gnats, shore flies, and leafminers. However, mealybugs, scales, and spider mites, as well as, eggs, larvae, nymphs and pupae will not be captured on sticky cards. Therefore, it is important to check plant parts (e.g. leaves and stems) during routine monitoring to determine the presence of non-flying insects and various life stages (eggs, larvae, nymphs and pupae).
5. Check the undersides of leaves.
Nearly all insect and mite pests and life stages are located on leaf undersides, so be sure to regularly check the undersides of leaves to detect the presence of non-winged aphids, mealybugs, scales and spider mites, as well as the eggs, larvae, nymphs and pupae of thrips, whiteflies and leafminers.
6. Maintain accurate records.
Always maintain records of your monitoring efforts by collecting information on 1) all major insect and/or mite pest problems during the growing season; 2) susceptible crops; and 3) location in the greenhouse — especially those areas near openings such as, doors, sidewalls and vents. Maintaining records will be helpful in allowing you to assess when and where localized infestations or “hot spots” of insect and/or mite pests occur.
7. Remove yellow sticky cards before releasing natural enemies.
Prior to releasing any parasitoids and/or predators, remove yellow sticky cards as the adults of many parasitoids and predators are attracted to yellow and will subsequently be captured.