It is harmful to the leaves and stems of peppermint.
It is easy to be infected in wet or dry weather from May to June. In the early stage, there were orange yellow powdery summer spores on the back of the leaves, and in the later stage, there were dark brown powdery winter spores. If not treated in time, the leaves will wither and fall off, and finally the whole plant will die.
At the beginning of infection, 20% Triadimefon emulsifiable concentrate 1000-1500 times or disodium rust 300 times was sprayed.
Also known as "white star disease", it is harmful to mint leaves.
May to October is the high incidence period. Specifically, there are small dark green round spots on the leaves, which will gradually expand into dark brown spots, with gray white star shape in the middle, dotted with black dots, and the leaves will slowly wither and fall off.
The diseased leaves should be removed and burned. Spraying 70% concentration of mancozeb and 75% concentration of .
500-700 times of chlorothalonil. Don't spray again 20 days before harvest.
This kind of pest will do harm to the seedlings. In spring, the stems of seedlings will be bitten by the larvae, resulting in the lack of seedlings.
The roots should be sprayed with 40% chrysanthemum oil and chrysanthemum oil 2000 times to 3000 times, or filled with 40% methyl isothiophosphate 1000 times.
This kind of insect pest will do harm to the flower bud and leaf, and the leaf will be bitten by its larva, resulting in holes.
Spray 50% of Antaibao emulsifiable concentrate (30-60ml /mu) or 50% of fenitrothion 1000 times with water. Do not spray again 20 days before harvest.
