WHEAT SHEATH BLIGHT CONTROL WITH APHIDS AND SPIDER MITES CONTROL
Sheath blight is a common disease on wheat. It mainly damages wheat leaf sheaths and stems. In the early stage of the disease, yellow-brown oval or spindle-shaped lesions appear on the leaf sheaths near the soil surface. Later, the diseased areas gradually expand and become darker in color. It develops to the stem of wheat. The symptoms gradually become obvious after wheat jointing. In the middle and late stages of wheat growth, the spindle-shaped lesions on the leaf sheaths are combined into a moire shape, with light yellowish brown in the middle and obvious tan rings around them. The lesions can expand upward along the leaf sheaths to the flag leaves. White moldy mycelium appear on the surface of the leaf sheath lesions in the middle and lower parts of the infected plant, which tangle into clumps and eventually form a large number of scattered brown particles (sclerotia). The infected stems can be easily lodging, and withered boots or withered white ears. The first and second nodes at the base of seriously infected plants turn black or rot, and usually die in their early stage. After the wheat turns green in spring when the weather becomes warm, sheath blight begins to occur; when the jointing stage of wheat, the disease rapidly spreads to a peak incidence. There are many rainy days in spring and high related humidity in the fields, which is conducive to the spread of the disease.
It is recommended that controlling sheath blight, meanwhile, control the aphids as well in the stage of wheat jointing or when sheath blight initially appears.
The recommended fungicides are Thifluzamide, Tebuconazole, Hexaconazole, Diniconazole, Epoxiconazole, Difenoconazole+ Propiconazole, Tebuconazole+ Trifloxystrobin, Azoxystrobin+ Tebuconazole. It is critical for better efficacy to use fungicides from different group, and sufficient dosage and water.
The recommended insecticides are nitenpyram, pymetrozine, flonicamid, dinotefuran, which are systemic insecticides with low toxicity, and good control effects on aphids. At the same time, if spider mites appear, these acaricides are recommended, such as Abamectin, Pyridaben, Propargite, Spirodiclofen, and Fenpyroximate.
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