How does planting soybean prevent and control bean moth?

How to control diamondback moth by planting soybeans? Please introduce the soybean diamondback moth: the harmful symptom is that the larvae feed on the leaves, and the lower instar larvae eat into mesh and notch shape. after the third instar, the larvae can eat all the bean leaves, so that the plant can not bear pods, which has a great impact on the yield. The occurrence regularity is the peak spawning period of adults from mid-late July to early August, the peak period of larval damage from late July to late August, and the yellowish mature larvae in early September to overwinter. Adults of living habits: adults go out day and night and have a strong tendency to black light. The activity begins in the evening, with strong flying ability and strong mobility. After mating at night, they lay eggs 3 days after mating, and most of the eggs are scattered on the back of bean leaves. Generally, 1 or 2 eggs are laid on one leaf, and the egg period is about 7 days. Larvae: the larvae are backlit, mostly on the back of leaves or branches during the day, and feed strongly at night, and can be eaten all day in cloudy days. The food intake of the 1st instar larvae is small and generally does not harm the plants. The 4th instar larvae have the habit of transferring harm, and the 5th instar larvae have a sudden increase in food intake, which accounts for more than 90% of the total food intake. The larval stage is 30-35 days. The occurrence of drought is not conducive to the occurrence of diamondback moth. The silted land with dense plant growth, low-lying terrain and fertile soil occurred more seriously, and the early-maturing soybean varieties suffered more seriously. During pupation and Eclosion, if Rain Water is moderate, it will happen seriously. If there are too many Rain Water, the occurrence will be postponed. Control methods to trap and kill adults: making use of the strong phototaxis of adults and setting up black light to trap and kill adults can reduce the number of eggs in bean fields and reduce the harm. Chemical control: the suitable period for the control of bean moth larvae should be controlled before the 3rd instar, with 4.5% cypermethrin 1500 × 2000 times per mu, or 50% phoxim EC 1500 times spray, 50 kg per mu. As the larvae have the habit of sleeping during the day and going out at night, the spraying time should be chosen after 5 p.m. Click to get more soybean planting technology click to get more grain and oil crop planting technology