First, the characteristics of occurrence
Soybean meal damage soybean (soybean) is both common and serious, is a common occurrence of major pests, occur in both southern and northern China. Its main features are: adults spawn on flower buds and tender larvae, larvae are mostly hatched at 6-9 am, newly hatched larvae do not eat egg shells, and after 15-30 minutes of crawling on the pods, they begin to spit out after a short pause. White filaments wrapped around the body of the insect, and then smashed holes in the pods, after 3-6 hours into the pods, and silkworms sealed hole, licking food in the locust. Newly hatched larvae will die if they do not pick up soybean meal in time. After 3rd instar larvae will turn to damage, a larva can damage 2-4 pods for a lifetime. After being bitten, the beans will lose their food value and seriously affect the yield.
Different temperature conditions, the egg larvae and larvae have different growth periods.
Second, the key to prevention and control technology
1. Grasp the larvae's spraying during the incubation period. First of all, do a good job in the field record, correctly grasp the soybean flowering period, and then calculate about 10 days as the Shengyu period. This is also the time for the moth and the egg-filling period of the soybean meal. After grasping the egg-filling period of the soybean meal, At that time, the temperature conditions at the time were compared with the egg growth period at different temperatures. Finally, the larvae hatching period was determined. The first spraying control was immediately carried out, and the second injection was repeated 4 to 7 days after spraying. , to kill the earliest hatching, have first drilled into the pods at the time of the first spraying, reach the 3rd instar after the first larvae crawling out of the larvae, and the last larvae that have not hatched into the pods. Sub-drug prevention and control can be described as "grasping the middle and taking care of both ends" of the prevention and control law.
2. Grab the larva's habits and spray it at the right time. The larvae hatch at 6 to 9 am. The newly hatched larvae first crawl for 15-30 minutes on the pods. At this time, the larvae are young and belong to the younger age. They have low anti-drug resistance and the most effective control effect is the use of medicinal spray. The best time to kill. Therefore, in the spraying control, must be held in the sunny morning 6-9 hours, otherwise, miss the opportunity to wait until it is wrapped in his body and drilled into the pod before spraying, it is not a good control effect .
3, according to different temperatures to determine the spraying period. The egg's reproductive duration is based on different temperature and hatched larvae, the higher the temperature, the shorter the egg's reproductive duration, the faster the hatching larvae, on the contrary, the temperature is slightly lower, the egg's fertility duration is longer, and the larvae are hatched. Slow, according to the situation provided in the above table, to grasp the changes in the weather, determine the incubation period of the larvae, spray immediately, you can receive a multiplier effect. After the larvae have entered the soybean meal, they must also grasp the temperature conditions of the first and second instar larvae at that time to calculate the time for the third instar larvae to drill from the soybean pods into the beach. Sprayed directly onto the body of the larvae, causing rapid death of the larvae.
4, use the touch and suction mixture spray. Soybean meal is a kind of borer pest. After it is drilled into the soybean meal, it is difficult for the medicine to come into contact with the body. At the same time, the contact pesticides are generally volatile and have a short potency. The effect is, therefore, when the medicament is exposed to the body of the bug, it has a control effect. When the systemic pesticide spraying, in addition to the direct poisoning of the contact with the body, but also through the various parts of the crop slowly absorb chemicals, larvae bite the plant body (including beans) indirectly sucked in pesticides and poisoning death. Therefore, the use of a mixture of two agents, contact and systemic, is the best method for poisoning borers. The main agent is to use a pyrethroid pesticide to add a little 90% crystal trichlorfon or 30% acephate EC and other systemic agents mixed spray.
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