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Yellow corn seedlings do not panic
How did the corn sprouts, which had grown bright and bright, become short and yellow and listless? Observe no traces of insect bites on the leaves or stems; No lesions or germs were found. In this case, the peasant allies did not panic, and the reason is probably rooted in the roots and roots of the underground. What exactly is corn cultivating sunflower mealworm, and why is it so harmful? What effective measures should be taken to deal with it? Let me answer one by one. Corn cultivars, sunflower locusts, use female adults and nymphs to injure corn. The female adults also have mung bean size, long oval shape, all flat, reddish-brown, covered with white wax powder, so called "powder mites"; nymphs are divided into two instars, first instar nymphs are smaller than millet grains, but also flat oval , but at this time it is not covered with white powder but is light yellow-brown and very active. It may not be found after a while of checking insects. The second-instar nymph is slightly larger and has a very nice snow-white wax powder. Corn ploughing powder is absorbed from the roots and near the ground in the Giken. The stems and leaves of the affected plants were yellow, the lower leaves were dry, and the dwarfs were weak, and the heavy ones were thickened and even the whole plant died. Checking for damage from this pest can be based on typical symptoms; there are many small black spots in the roots, and the root tips are black and rot. Since last year, in the summer corn fields in cities and counties in Handan, Xingtai, and Shijiazhuang, corn cultivars have become important pests in the seedling stage to the middle and later stages. It has been reported that this year's occurrence of this insect is higher than last year. Corn cultivars, sunflower mealybugs, occurred in 3 generations in the south-central part of the province. The occurrence of summer corn in June was the second generation. The third generation occurred from early August to mid-September. Among them, the second generation is the main detrimental generation, when corn is in the seedling stage, the stems and leaves are tender, the juice is numerous, and the seedlings are weak. If the population density is high, it is bound to be seriously endangered. Because this insect hides in the ground, it is difficult to be found on the one hand, and on the other hand, it is protected by wax powder and it is difficult to control it. A farmer asked me: "I am spraying insects in corn fields. Why can't I plough the sunflowers to death?" This is the result of improper control techniques and failure to grasp appropriate prevention and control measures. The first period of appropriate control is at the first instar nymph stage. At this time, no wax powder solution can directly contact the wall of the insect body; the second application method is to water the corn root, and 50% methamidophos or 50% can be used Emulsion 1000 times liquid, mu about 125 liters of spraying liquid, with good results.