1, hazards:

Bean pods use larvae to harm bean leaves, flowers, and bean pods. They often damage the leaves of the pods and feed into young pods. They accumulate fecal pellets in the pods and outside the pods. The pods are bitter and unpalatable. 7 generations occurred in the local area in one year and wintering in the soil. A total of 5 larvae were larvae. The newly hatched larvae entered the tender larvae or flower buds to feed on the larvae, resulting in the loss of buds and pods. The local average rate is 14% to 26%, and the serious rate is more than 60%.

2, control methods:

1 Do a good job of forecasting insects and master the appropriate period of control. Select one or two blocks of field bean fields or other legume crops that are representative of the local area. Randomly sample and survey about 100 flowers from the initial flowering period to investigate the number of flower buds and insects. When the rate of flower bud damage reaches 10% or 15 flowers and insects are needed, spraying control is needed. The optimum period for optimal control is generally 2 to 3 days after the peak of anagen 5 to 6 days after the oviposition peak of the bean pod borer or 1st instar larvae.

2 Clean the field and timely clear the flowers in the field, and remove the damaged flower buds. Collect the collected flowers, pods and other objects to burn or bury them deeply to reduce the source of insects and prevent the larvae from being transferred. It's best to plow frozen pods before winter to reduce fieldworms.

3 Light trapping. Where conditions permit, frequency-vibrancy insecticidal lamps or black light lamps can be set up in the fields, and light trapping can be carried out using adult phototaxis.

4 cover insect nets. Covering insect nets can effectively cut off the spread of insects, and have a certain effect on bean sprouts.

5 chemical control. Available with 48% Chlorpyrifos EC 1000x, 52.25% CCFL 1500x, 5% Rhodamine SC 1500x, 4.5% Cypermethrin EC 2000x, 20% Chrysomethrin EC 1000x, 2.5 Percentage of kimchi emulsifiable concentrate 1000 times, 10% Distillation 2000 times and 15% suspension concentrate 3000 times. Different pesticides should be alternately used for rotation and pay attention to the strict safety interval of pesticides. Usually 3-7 days.

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