What pests and diseases should be guarded against before flowering
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On the one hand, we must pay close attention to the prevention and control of major hazards, on the other hand, we must pay attention to the protection of natural enemies, try to use selective pesticides that have little effect on natural enemies, or minimize the application of natural enemies in the application methods. hurt. To create a good situation for the comprehensive prevention and control work throughout the year. The main control targets in this period are apple tree rot, powdery mildew, hawthorn leafhopper, golden tortoise shell, aphid, etc., and should be generally controlled or treated according to the occurrence.
First, continue to do the treatment of apple rot disease spots on the basis of early spring cure, check again, continue to adhere to the treatment and disinfection of disease spots. When the drug is disinfected, the cured lesions should be disinfected again to prevent the recurrence of the disease. Apple trees with major diseases such as trunks, main branches, and backbone branches can be bridged, communicate nutrients, restore tree potential, and preserve the resulting branches.
Second, the prevention and control of spider mites and powdery mildew in the flowering hawthorn leaves in the peak period of the stagnation? The hole in April, mid-Autumn? Snow and apple all-clawed cockroach wintering eggs hatching period, after the flowering generation, if the peak period, the end of April to At the beginning of May? Snow, when the female adult cockroaches average 1 to 2 heads per leaf, immediately carry out the whole garden control, spray blasting 3,000 times or Nisolon 1500 times, or use 50% sulfur suspension 2000 times. Can also cure powdery mildew. If the powdery mildew is serious and the top bud damage rate is 5%, it can be sprayed with 15% powder rust 1500-2000 times liquid or 12% myclobutanol 3000 times solution. The effect is very good. If both pests and diseases occur at the same time, the drugs for controlling leaf axils and powdery mildew can be mixed.
Third, the killing of the golden tortoises The golden tortoises that are endangered during the flowering period are mainly the sweet-skinned tortoises, the small blue-and-white golden tortoises You can use the fake to death of the golden tortoise shell, kill trees in the early morning and evening, or apply 4% of the enemy horse powder on the ground to kill the adult. You can also set a black light group in the orchard or hang a trap to smother the black velvet golden tortoise shell.
Fourth, the application of curative treatment The main control object of the flowering period is Spiraea sinensis, acupoint apple jaundice, snow and apple sputum.
It can be controlled by the following two methods.
1Drying of the drug: In the early stage of the occurrence of the aphid in the middle and late April, the diluted drug solution with the systemic effect can be directly applied to the upper part of the trunk or the base of the main branch with a brush, and coated with a 6 cm medicine ring. . If the tree is rough, you can scrape the rough skin first, but don't hurt the tender skin. The hole is slightly white. Snow, coated with plastic film or waste newspaper after application. The drug can be used with 10% imidacloprid 100 times solution, the effect is very good, and does not harm the natural enemies, but the drug effect is slow, and the drug effect is only 3 to 5 days after the application, so it should be used at the initial stage.
2 Spraying on the tree: When it occurs, it can be sprayed with selective agent 0.6% worms 3000~4000 times before the leaf curling or just starting to roll the leaf. Note that the tumor should be used before flowering and after flowering. not effectively.
V. Prevention and control of the beetles of the beetles The beetles that harm the apples are mainly mulberry cattle, pear-eye beetles, and beetles. For the prevention and treatment of the beetle, a method of plugging a hole in an aluminum phosphide tablet or a 1500-fold injection of 80% dichlorvos may be employed.
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