Pyrazilamine and pyrimethanil are highly effective fungicides for the control of gray molds that have been marketed in recent years, reducing the resistance of vegetable crops to long-term use of old pesticides. However, the safety of such medicaments on different vegetables is different. Attention should be paid to the following issues when using them.
1, cucumber spraying this medicine will produce chlorotic yellow spots. Cucumbers grow flowers and young melons show malformed melons with yellow-green spots. Burning and whitening occur in leaves under high temperature and high humidity conditions. In the leaves of the phytotoxicity, the leaf margin is irregularly chlorotic and yellowish, and there are serious white spots. It is recommended that cucumbers disable such agents. Overwintering lettuce and oil-vegetables after spraying this herb leaves the leaf edge into a light yellow halo, which is often mistaken for low-grade malnutrition in the spring. It should also be used with caution.
2. The effect of this kind of drugs on the prevention and treatment of gray mold is very good for tomato, but the safety is different under different species and environmental conditions. It is safe to use large red pods below 26°C in early spring, but it will be applied in high temperature and high humidity environment. Foliar edge yellowing phenomenon, often considered to be magnesium deficiency. It is recommended to use it carefully under high temperature and high humidity conditions.
3, pepper, eggplant no phytotoxicity, but it is recommended to avoid flowering spray drug, such as wolfberry flowers should be strictly controlled concentration in addition to commonly used when adding Shiler drug control gray mold outside the pyrimidine amine concentration should be 1000 times more than liquid.
4, when the melon-assisted pollination sprinkler when adding pyrimidamide, the concentration should be controlled at 700-1000 times the liquid, safe and can achieve good disease prevention effect of melon.
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