Soybean leaf roller is the main pest in summer and autumn soybean production, in addition to harming soy, but also harm the legumes such as mung bean, peanut. In recent years, with the increase of winter temperatures, the amount of overwintering insects has increased, which has been aggravated in the soybean field year after year. At present, it is the time for the damage of soybean leaf roller that should be prevented and controlled in time.
Soybean leaf roller larvae damage the bean leaves. Before the 3rd year of age, the leafy meat is not curled. After 3rd age, the leaves start to roll. The 4th instar larvae roll the bean leaves into a tube, latent in it, and sometimes the leaves are rolled up. Together, it often causes falling flowers. Adults live in a nocturnal cycle, with phototaxis, and they prefer to be active in the evening. Eggs are spawned on the back of soybean leaves, and the larvae mature in the leaves after being matured.
According to relevant data, Sophora japonica enters the dying stage of larvae from mid-July to early August, and the most serious damage occurs from late July to early August. The strain rate of field rolling leaves has increased significantly. With a rate of over 90%, it will enter the peak period of late-mid-August in late August, and will be the adult stage of the first generation from late August to early September. It will be the second-generation larvae in September. The rainy and humid climate is conducive to the occurrence of soybean leaf roller pods; the densely growing soybeans, late-maturing varieties, and few varieties of leaf hairs have more severe nitrogen fertilizer application or late sowing.
Chemical control is currently an important means of preventing and controlling Soybean leafhoppers. It should be started and controlled every generation of egg hatching (see 1%-2% of plants in the field with leaf curling hazards) and controlled every 7-10 days. Once, continuous control 2 times. The agents that can be used are cyfluthrin, beta-cypermethrin, fenvalerate, chlorpyrifos, indoxacarb, fipronil, glycosides, avermectins, and the like.
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