In recent years, at the end of June and early July, when the summer sowing maize grows to more than 3 leaves, the yellow leaves tend to appear yellow and twisted. It seems that the herbicides are harmful to the leaves. Sometimes there are irregularities on the newly opened leaves. The yellow-white transparent spot, when severe, the dwarfing of corn plants is not long, which resembles the symptoms of dwarfism. After the big bellmouth is rotted before and after rain, the heart forms a suspected top rot. Pull the leaves down and follow the heart to look carefully into the corn. There will be small dark brown or yellow-brown bugs crawling in and out. This is Huangdengjima.
The worms of the larvae of the larval Dendrobium nobilis live in the base and leaves of the grass weeds in the winter. They migrated from the gramineous plants to the corn in the middle and late spring of May, and they bred on the corn for 2 generations. The first generation nymphs in late May to 6 At the beginning of the month, it occurs on spring corn or wheat crops. In mid June, it enters the age of adulthood, June 20 is the peak of the egg, and in late June is the nymph prosperous period. In early July, the adult occurs on summer corn. Parthenogenetic reproduction. Drought and wheat stubble coverage are the main factors for the serious occurrence of yellow stagnation horses in the summer sowing corn field. The shortage of water, fertilizer, roadsides, and ditched corn are heavy.
Drought and watering and topdressing are a practical agricultural measure for preventing and controlling corn sedative yellow fleas. When it is found that the fulvus is serious, it should be sprayed as soon as possible.
Selection of drugs: imidacloprid plus pyrethroid insecticides, avermectin plus acetamiprid, thiamethoxam plus pyrethroid insecticides and other agents have good control effect.
Spraying: spraying in the cool morning or early evening, it is best to use a straight sprayer to spray the liquid into the corn heart. Add the foliar fertilizer containing zinc in the liquid. Zinc is very much liked to supplement zinc nutrition, and the effect of promoting the healthy growth of corn is very significant.
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