The first part of the infection of Fusarium graminearum is anther, followed by the inner wall of the glum. The spores of the pathogen spread to the panicle during the flowering stage, invade the spikelets from the wilting anthers, or invade directly from the base of the spikelets through the gaps of the glumes without anthers. The infection of Fusarium graminearum was concentrated in the flowering stage of wheat, and the infection rate of Fusarium oxysporum decreased after the final flowering. Therefore, the first prevention and control of wheat scab should be mastered in the early stage of flowering, susceptibility to disease or rain during heading and flowering, and should be treated once every 5 to 7 days to ensure control.
Tetraconazole, carbendazim, tebuconazole and cymene are all suitable drugs for controlling wheat scab. Suitable application has good control effect against wheat scab. Tebuconazole and carbendazim have strong systemic conductivity, and cymene has good systemic and certain conductivity. According to Li Hengkui and others of the College of Plant Protection of Nanjing Agricultural University, "The bioactivity and susceptibility of cymene to Fusarium graminearum", it is reported that cymene can pass through the roots of wheat. It is transported upwards in a duct or xylem by short-distance transport; the drug absorbed by the middle of the wheat leaf is more capable of transporting to the tip of the leaf, and the ability to transport to the base of the leaf is weaker; the drug is cross-layered at the wheat leaf The drug is poorly transported, and the drug absorbed by the lower leaves is difficult to transport to the upper leaves; the drug is poorly transported in the panicle neck. When using this medicine to control scab in the heading stage of wheat, the medicine should be sprayed to the ear as much as possible.
The first time to control wheat scab is to be in the early stage of wheat flowering. At this time, some of the ears may not be extracted. Etoluene, carbendazim and pentane, which have better systemic conductivity, may be used. The oxazol should be administered at the second dose.
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