Prochloraz is a broad-spectrum fungicide with obvious control effects on various crops caused by ascomycetes and deuteromycetes. It can also be mixed with most fungicides, fungicides, insecticides and herbicides. Have a good control effect. It has therapeutic and eradicative effects on various diseases on a variety of crops; especially in recent years, it has achieved good control effect against rice seedling disease; recently, there has been a bad phenomenon: rice seedling pathogens produce prochloraz Drug resistance.
What causes the rice blast fungus to become resistant to prochloraz? The following summary of Chinese Pesticide small plait "moniliforme causes prochloraz resistance."
Reasons for the resistance of rice seedlings to prochloraz. The experts used hypha growth rate and microscopic observation to study the growth and mycelial growth morphology of probiotics against susceptible strains of rice seedlings and resistant mutants. Impact. The results showed that 0.5 mg / liter of prochloraz solution can completely inhibit the mycelial growth of sensitive strains, can not inhibit the mycelial growth of resistant strains with different resistance levels; 20 mg / liter of prochloraz solution can completely inhibit parental sensitivity The spore germination of the strains inhibited the spore germination and germ tube elongation of different resistant mutants by 84.1%-89% and 58.5%-65.8%, respectively, indicating that the resistant mutant strains grew in mycelium, spore germination, and buds. The sensitivity of the drug to the agent at different stages of tube elongation is reduced to a different extent than that of the parental sensitive strain. After treating the hyphae with 10 mg/L of prochloraz solution for 12 hours, the hyphae of the parental sensitive strain expanded and deformed, and the hyphal top of the resistant mutant expanded, but there were many small branches on the hyphae, indicating that the agent was antagonistic. The inhibitory effect of the secondary mutant hyphae of the mutant was not obvious.
The above is the reason why rice seedling pathogens are resistant to prochloraz . For more information on pesticides , please log in to China Pesticide Network for enquiry!
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