Suspension traps are a new technology that uses vegetable pests to prevent and control color pests. They are mainly used to control many pests such as aphids, Liriomyza, and whiteflies. The technology has the characteristics of low cost, environmental protection and convenience of production. It can effectively eliminate pests, reduce the number of pesticide applications, reduce environmental pollution, and improve the quality of vegetables. It has been widely used in vegetable cultivation in the Beijing suburbs. However, in the course of the investigation, it was discovered that during the process of using this technology, some farmers frequently had problems such as high suspension height and position, excessive density, and inaccurate replacement. Hereby remind farmers to note the following points when using:
Suspension time should be used at the seedling stage and after planting, from the early to the early stages of the pest occurrence.
Color selection Planting melons and tomatoes in the greenhouse is suitable for hanging yellow boards; the eggplant greenhouse is suitable for hanging blue boards. The greenhouse for growing spicy (sweet) peppers is suitable for yellow and blue boards. The yellow plate is mainly used for trapping whitefly, winged aphid, spotted leaffly, leafminer, onion fly, etc.; blue plate is mainly used for trapping and killing various horses such as flower horse, western flower thrips, green onion, etc. .
The height of the suspension is usually within the seedling shed, with the bottom of the swatches being 5–10 cm higher than the top of the vegetable crops. It is advisable to produce a height of about 20 cm in the production sheds. Too high pests are not easy to adhere; too low is easily covered by vegetables, and it affects the collection of pests far away. Swatches should also be adjusted to set heights as the vegetables grow.
Suspended position within the span of 7 meters in the canopy room, can be placed in a row in the middle of the studio room forward; span in the 7-11 meters of the studio room, according to the "zigzazi"-shaped hanging in the studio two lines. The east-west direction is appropriate for the direction of suspension.
At the beginning of the suspension quantity, 3-5 swatches shall be hung for monitoring the type and quantity of pests. When there are more insects, the number of swatches shall be increased according to the actual situation. Generally, 30 plates of medium-sized plates (25 cm and 30 cm) are set per mu. About 25 large plates (30 centimeters and 40 centimeters) are left and right.
Replacement color swatches are usually replaced around 45 days. However, when the amount of insects is large and the swatches are full of pests, they need to be replaced.
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