Pay attention to the occurrence of diseases and insect pests in wheat seedling stage
Under normal circumstances, about 15 days after wheat sowing, wheat seedlings basically grow, and all kinds of diseases begin to occur one after another. here are several methods to control wheat seedling diseases and insect pests. Wheat aphid: wheat aphid can not only directly damage and reduce wheat yield, but also spread wheat yellow dwarf disease. When the rate of aphids is more than 5% and the number of aphids per hundred plants is about 10, chemical control should be carried out. Use 25ml of aphid lice net per mu or 20 grams of imidacloprid or 20 grams of imidacloprid to spray 40-50 kilograms of water, and can also control wheat red spiders. Underground pests: the underground pests that harm wheat at seedling stage are mole cricket, grub and golden needle worm. It is observed that when the mole cricket is damaged, the tender stem of the wheat seedling is bitten into a mess, and the fracture surface is irregular; when the grub is damaged, the root and stem of the wheat seedling is bitten off and the fracture is neat; the golden needle worm drills and eats the tender heart of the wheat stem, and the injured part is hemp-like, but the outer skin is still connected. By carefully observing the damage of wheat seedlings, we can determine which kind of underground pest appeared in the wheat field. Spread poisonous soil: mix fine soil with 2% methyl isosphos powder 2 kg per mu, mix it well and apply it into wheat ridges, which can effectively control the damage of grubs and golden needles. Sprinkler irrigation potion: for plots damaged by spot patches, 40% methyl isophos or 50% phoxim 0.5 kg / mu can be used for 60 kg / mu of water, and wheat roots can be sprayed along ridges, which has a special effect on grubs and golden needles. Locusts and crickets: in recent years, the occurrence of these two kinds of pests is very large, often to harm early sowing wheat seedlings, can use 90% crystal trichlorfon 75 grams per mu, first with hot hydration and then add water to 1.5 kg, spray and mix 5-7 kg of fried wheat bran into poison bait, spread traps along the ridge, the effect is very good.
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Comprehensive control methods of wheat take-all disease
Wheat total erosion disease is a typical root disease, which can be infected from sowing to harvest. The main site of the disease was in the root of wheat and the 1-Murray 2 node at the base of the stem. After infection, the roots blackened and rotted, lost the ability to absorb water and nutrients, and caused the aboveground parts to dry up and die, resulting in white ears. One.
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Occurrence and Control Countermeasures of Wheat Yellow Dwarf Disease
Wheat yellow dwarf disease is a viral disease mainly transmitted by aphids, and its damage is quite serious in some years. When the symptom is susceptible to disease at the seedling stage, the leaves lose green and turn yellow, and the plants are seriously dwarfed, and the leaves of seriously diseased plants often cannot survive the winter, or cannot jointing and heading after overwintering. The dwarfing of the late susceptible plants was not obvious, and the upper part.
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