Attention to controlling soybean leafhoppers
2020-04-01 12:07:10
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 information, Sophora japonica occurs in Rudong County for 2 generations a year. From late June to early July, it enters the overwintering period of adulthood. In mid-July, it is the wintering adult's spawning period. In mid-July, In the first half of August, the generation of larvae will enter the peak period. From late July to early August, the most serious damage will occur, and the rate of field leaf rolling will increase significantly. The strain rate of field leaf rolling will be more than 90%, and it will enter the middle and late August. During the peak period, the period from the end of August to the beginning of September is the generation period of adults, and September is the second generation of larvae. 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 available agents include cyfluthrin, beta-cypermethrin, fenvalerate, chlorpyrifos, indoxacarb, fipronil, tebufenozide, abamectin, and the like.
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 information, Sophora japonica occurs in Rudong County for 2 generations a year. From late June to early July, it enters the overwintering period of adulthood. In mid-July, it is the wintering adult's spawning period. In mid-July, In the first half of August, the generation of larvae will enter the peak period. From late July to early August, the most serious damage will occur, and the rate of field leaf rolling will increase significantly. The strain rate of field leaf rolling will be more than 90%, and it will enter the middle and late August. During the peak period, the period from the end of August to the beginning of September is the generation period of adults, and September is the second generation of larvae. 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 available agents include cyfluthrin, beta-cypermethrin, fenvalerate, chlorpyrifos, indoxacarb, fipronil, tebufenozide, abamectin, and the like.
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