Triazole fungicides are widely used in fruits and vegetables, such as powdery mildew, leaf spot disease, brown spot disease, black spot disease, etc. Triazole fungicides have the effect of inhibiting crop growth, converting vegetative growth into reproductive growth. This type of drug can generally be used at standard concentrations. If the concentration is too high, it may inhibit growth, so it is best not to use it during the flowering and young fruit stages. If used, do not get it on flowers and young fruits. Propiconazole and flusilazole inhibit growth most significantly, tebuconazole is in the middle, and difenoconazole and hexaconazole are relatively safe.
Propiconazole
It can be absorbed by roots, stems, and leaves, and can quickly conduct upward in the plant body to prevent and control diseases caused by ascomycetes, basidiomycetes, and deuteromycetes, especially wheat take-all, powdery mildew, rust, root rot, rice malaria, and banana leaf spot. It has a good control effect.
Tebuconazole
Not only has a similar mode of action to triazole, but also develops a second mechanism to inhibit the occurrence of resistance. It can also be mixed with other systemic or non-systemic fungicides to effectively prevent and control cereal and seed-borne diseases. It is mainly used for nearly 30 diseases of various crops such as Chinese cabbage, strawberry, soybean, high light, classified province, cucumber, bitter melon, pear, apple grape, rice rubber, wheat, corn, etc. The main dosage forms are seed treatment suspension seed dressing agent, dry seed dressing agent, wet seed dressing agent, water dispersible granules, emulsion, microemulsion, suspension, etc.
Hexaconazole
The drug has a wide antibacterial spectrum and has a broad-spectrum protection and eradication effect on diseases caused by fungi (especially Basidiomycetes and Ascomycetes). The usage is lower than other triazole fungicides. Registered crops include cucumber, wheat, rice, pear trees, apple trees, peach trees, etc., mainly due to the prevention and control of powdery mildew, black spot, sheath blight, brown spot, rust, etc. The main dosage forms used are emulsifiable concentrates, water-dispersible granules, microemulsions, suspensions, etc.
Difenoconazole
Difenoconazole is a relatively safe triazole fungicide. It is widely used in fruit trees, vegetables and other crops to effectively prevent and control black spot, black pox, white rot, leaf spot, powdery mildew, brown spot, rust, stripe rust, fusarium head blight, etc.
Myclobutanil
It is a highly effective, broad-spectrum, systemic, low-toxic triazole fungicide with protective and therapeutic effects. It is used to prevent and control ascomycete, deuteromycete and basidiomycete diseases of various crops, and to prevent and control powdery mildew, black spot and other diseases on cucumbers, pears, apples, grapes, bananas and wheat.
The main registered dosage forms are wettable powders, emulsifiable concentrates, water-dispersible granules, emulsions in water, microemulsions, suspensions, etc. Seed treatment can prevent a variety of seed-borne and soil-borne diseases of crops such as wheat, barley, corn, cotton and rice. It can also be used for the prevention and treatment of storage diseases.
It is best not to use tebuconazole and hexaconazole in the first two times after flowering, because poor concentration control will make the apple stalk short and affect the expansion of the fruit. Difenoconazole is relatively safe and has good effects on white powder and black spots.
All three can be used for the last time before bagging, and the young fruits are deeply sterilized before bagging. Propiconazole should be avoided as much as possible in northern orchards because of its poor safety.
Within one month after the apple flowers fade, at least one azole drug is added to the first three times of bagging to prevent and control white powder, leaf spots, brown spots and other diseases. It is usually carried out at the recommended concentration. For example, 43% tebuconazole is generally used more than 5,000 times, and 10% fenoxone is used more than 5,000 times, which is relatively safe.
