The core tips: After wheat turns green, it begins to enter the period of vegetative growth. At this time, it is also the multiple period of multiple diseases. The types of pests and diseases that affect wheat growth are numerous and difficult to control. Some farmers often have unclear types. Blind medications have no effect, and even worse, they can cause growth problems in wheat. How to effectively control pests and diseases, it has to "prescribe the right medicine."
Diseases
In the early stage of sheath blight, small yellowish spots were first produced on leaf sheaths near the ground, followed by typical yellow-brown fusiform or moire-like spots. The lesion gradually enlarges and the color darkens, causing the internodes of the diseased plant to rot.
Solution: Use jinggangmycin (or thiadiamide or epoxiconazole) + benzonicyclizine + brassinolide (or Bi-Pro. Tianda 2116) + potassium dihydrogen phosphate spray, depending on the incidence and growth Spray 1 to 3 times, interval 7 to 10 days again.
After the root rot was sown, the seeds were damaged, and the young buds were found to have brown spots and died when they died. The roots suffered brown or black lesions, less roots, and brown streaks at the base of the plant stems. In severe cases, the stems were broken and dead.
Solution: Metalaxyl or clodronoxime or hymexazol + benzopropiconazole + brassinolide (or Tianda 2116. Bihui) + potassium dihydrogen phosphate, according to the severity of the disease and plant growth 1 to 3 times, 7 to 10 days apart.
Viral Disease Virus Diseases are the most common among the scallop mosaic virus and soil-borne mosaic virus diseases. In the former, the young leaves of the diseased seedlings appear chlorotic or distorted. After the winter, the diseased seedling begins to chlorotic from the tip of the leaf or the middle of the next leaf, and gradually expands into yellow-green mottled or irregular stripes.
Solution: Do you indole copper acetate + lentinan (or amino oligosaccharine) + avicin + imidacloprid + brassinolide + potassium dihydrogen phosphate foliar spray, even spray 2 times, interval 7 ~ 10 day.
Pests
Wheat spiders use nymphs and adults to eat wheat leaf sap, and small white spots appear on the victim leaves, and the yellow wheat leaves turn into yellow, the wheat plants are short, and the whole plant is dry.
Solution: Use avicin or 1.8% abamectin 1000 times + 2.5% bifenthrin 800 times to select the noon time foliar spray.
The golden worm larvae feed the sown seeds, sprouts, and roots of the seedlings in the soil, causing the crops to wither and die, resulting in the lack of seedlings and ridges, and even the destruction of all fields.
Solution: (1) Use seed dressings containing imidacloprid, thiamethoxam, carbofuran, or thiadiazole, imidacloprid, and chlorpyrifos as the granules for soil treatment at the time of sowing. (2) After the occurrence of insect pests, use chlorpyrifos, phoxim, and lambda-cyhalothrin to irrigate the roots or twist the sprayer's sprayer and spray directly against the roots.
The nematode-infested wheat seedlings were dwarf yellow, with short roots and bifurcations. Later, the roots were parasitized as neoplasia, exposing white-brown and dark brown granular cysts. Infection at seedling stage has a greater impact on yield. Once it happens, it is difficult to control.
Solution: Soil treatment with avermectin, thiazophosphonium, and gram-phosphorus granules during the sowing of wheat.
Deficiency
Nitrogen deficiency: The plants are small and weak, with few and weak tillers. The leaves turn yellow from bottom to top, and the tip is dry and dead.
Phosphorus deficiency: before plant winter, the tip of the plant is reddish purple, and the leaf sheath is stripy purple.
The solution: nitrogen deficiency seedlings can be Mushi 20 kg of urea; phosphorus deficiency seedlings can be Mushi 15 to 20 kg of diammonium phosphate, or foliar spraying potassium dihydrogen phosphate 2 to 3 times.
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