Control of wheat sheath blight by early application of Thiofuroamide in spring

In recent years, the planting area of direct seeding rice in northern Jiangsu and other places is large, which leads to the late sowing time of wheat. In order to ensure the yield of late sowing wheat, the sowing rate is often greatly increased, the amount of seeds used in high fields is 20kg to 30kg per mu, the growth of wheat seedlings in the field is too dense, with the recovery of air temperature in spring, the growth of wheat resumes rapidly, and the canopy density in the field will further increase. It is beneficial to the occurrence of sheath blight. In November 2011, the rainfall in northern Jiangsu is sufficient, the field humidity is high, sheath blight has occurred in some fields, and there are obvious black spots in wheat leaf sheath. It is expected that the occurrence of wheat sheath blight after the temperature rise this year is more serious than that of last year. Chemical control in early spring is an important means to control wheat sheath blight. At present, Jinggangmycin, Jinggang Bacillus cereus, Jinggang Bacillus subtilis and other drugs are mostly used for prevention and control, but the duration of these drugs is short, and farmers often wait until after the disease to start using drugs, the effect is poor. Thiofuramide is a benzamide fungicide, registered for the control of rice sheath blight, has a high selectivity, has a good control effect on rust, smut, sheath blight and other diseases, and lasts for 30 to 45 days. In recent years, the author has carried out a study on the application of thiofuramide on wheat. The experimental data show that 24% thiofuramide suspension was used for 10 ml and 20 ml per mu on March 5 and March 15 before jointing, respectively. the control effects on sheath blight 30 days after treatment were 94.38%, 97.78% and 97.41%, respectively, and the white ear rate was 0. However, on April 5 and April 15 after jointing, the control effect of the same chemical treatment on wheat sheath blight decreased significantly. The results show that wheat is the best period to control sheath blight before jointing. The use of 24% thiofuramide suspension 10ml / mu can effectively control the occurrence of sheath blight, reduce white spike and increase yield.