During the growing period of soybean, it is harmed by many kinds of pests, resulting in reduced production and declining quality and affecting yield. Now we will introduce the characteristics and control techniques of several pests as follows.
1. Bean Moth Bean Moth Popular name bean worm (mother worm), the larvae damage soybean leaves, resulting in nicks or holes, ranging from eating into a net, in serious cases will eat beans into a light bar, not scab, affecting production. Generally in the middle and late July to early August is the period of adult oviposition, from late July to late August is the larval stage, the early hatching larvae are backlit, lurking during the day, dorsal, 1 instar -2 age infestation top bite The leaf margin becomes a short cut and usually does not migrate. The increase in food intake in the 3rd instar and 4th instar means the damage to the plant. This is the appropriate period for prevention and control. The 5th instar is a gluttony stage and accounts for about 90% of the larval diet. From June to August, the coordination of rainwater is conducive to the occurrence of pod moths. Soybean plants grow densely. Low-lying and fertile soybean fields and pod moth adults lay more eggs and cause more damage.
Control method: Spraying treatment in the 3rd instar larval stage, 50% phoxim emulsion 1000 times or 20% cypermethrin 2000 times, or 20% cypermethrin EC or 2.5% deltamethrin Emulsion 2 000 times, spray 50 kg per mu.
2. There are many kinds of bridge insects in soybean and bridge toxin. The larvae damage the bean leaves, eat the tender tips, flowers and larvae, and can eat the leaves to cause falling flowers and falling leaves. The grains are not full, which seriously affects the yield. Bridge-building insects can occur for many generations each year, with the heaviest damage occurring in particular from mid-July to mid-August. Adults live in ecstasy and have strong phototaxis. They like to lay eggs in densely growing soybean fields, and eggs are spawned on the back of the upper leaves of the bean plants. When the larvae are young, they only eat leafy meat, leaving the epidermis with a window hole. 3rd instar larvae damage the upper leaves into holes, mostly at night.
Control methods: 20% methionin EC or 2.5% deltamethrin EC 2Ox can be used, spraying 40 kg/mu.
3. Weevil Weevils eat plant stems and leaves.
Control methods: 50% phoxim EC 1500-2000 times or 20% cypermethrin 2000 times evenly sprayed.
4. Soybean borer Soybean borer, also known as soybean borer, eats pods from larvae. The larvae enter the larvae with a white wire mesh before they enter. Generally, the larvae enter the joints of the bean pods, and the damaged bean pods bite into a channel or break. shape.
Control methods: 10% cypermethrin EC, mu 35-45 ml, or enemy killed EC, active ingredient 0.5-1 g, watering 40 kg uniform spray.
5. Soybean aphids have been infested since the seedling stage, and the plant growth points, young leaves, tender stems, and tender nymphs have been used as feeding targets to spread the virus, resulting in leaf curling, slow growth, reduced number of scabs, and severe seedling emergence. The whole plant died.
Control methods: 50% phoxim EC 1500-2000 times or 20% cypermethrin 2000 times evenly sprayed.
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