Pyrimethanil has special effects on gray mold, so it is widely used, but if it is not used properly, it is extremely prone to phytotoxicity. Therefore, the Chinese pesticide net Xiaobian has compiled the precautions for the use of pyrimethanil to avoid the occurrence of phytotoxicity:
Pyrimethanil is an anilinopyrimidine fungicide with good effect on gray mold. It has a strong systemic conduction effect, and it can quickly reach the parts of the plant where flowers and young fruits cannot be reached after application, and the disease is quick and stable. Moreover, the effect of the drug is not sensitive to temperature, and it is applied at a relatively low temperature, and the effect thereof is not changed, and the effect of controlling gray mold is still good.
I. Potato and eggplant phytotoxicity <br> But if pyrimethanil is used improperly, it is easy to cause phytotoxicity on eggplant. There will be many dark brown spots on the leaves, irregular shape or yellowing of leaves. When there are spots of phytotoxicity, many vegetable farmers also think that eggplants have "spotted deciduous disease", and as a result, they are again used to aggravate the phytotoxicity. Therefore, it is necessary to distinguish the damage of pyridoxamine plague spots and invasive disease spots. symptom.
The phytotoxicity of pyrimethanil on beans (canola, cowpea, cowpea, etc.) is mainly caused by severe yellowing, dryness, brown spots, and even leaf loss, and the same flower and fruit will also fall off.
The sensitivity of beans and eggplant to pyrimethanil is not to say that this medicine cannot be used, but rather to use it or to strictly control the concentration. Here, I give a reasonable use concentration of beans and eggplant: the amount of active ingredient of pyrimethanil should not exceed 6g ai / mu. For example, 40% of pyrimethanil?? Isocarbazone suspension (which contains 15% of pyrimethanil), can only use up to 40g per acre on beans and eggplant.
Second, pyrimethanil cucumber phytotoxicity
Spraying this medicine on cucumber produces chlorotic yellow spots. Cucumber scented flowers, young melons with yellow-green spots, burning and whitening under high temperature and high humidity conditions. The leaves of the medicinal plants are irregularly chlorotic and yellow, and there are severe white spots. It is recommended that cucumbers ban such agents. After spraying this medicine, the leaves of the lettuce and the oily wheat are turned into a light yellow halo, which is often mistaken for the lack of fat in the spring, and needs to be used with caution.
Third, pyrimethanil tomato phytotoxicity
Tomato is ideal for controlling gray mold with such drugs, but the safety difference is different under different varieties and environmental conditions. It is safe to apply large red sassafras in the early spring at 26 °C, but it will occasionally be applied in high temperature and high humidity environment. The phenomenon of rim yellowing is often considered to be magnesium deficiency. It is recommended to use it with caution in high temperature and high humidity environments.
Fourth, pyrimethanil melon phytotoxicity
When melon is used to assist pollination and spraying, the concentration of pyrimethanil is added. The concentration should be 700-1000 times. It is safe for melon and can achieve good disease prevention effect.
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