In August, the flower bud differentiation of apple trees was still at its peak. The tree nutrients were mainly transported to the fruits and the fruits quickly expanded. Uncropped red varieties gradually colored and yellow varieties gradually yellowed. Early maturing varieties such as Jura gradually mature. What did Apple Garden Management pay attention to in August? Professor Ma Zhifeng of the Yangling Vocational and Technical College proposed guidance for the majority of farmers.
Ma Zhifeng said that due to the high temperature in August, pest and disease activity is still relatively active. In particular, early defoliation, ring rot disease, anthrax, etc. are more harmful in rainy years. The damage degree of various leaf-feeding pests such as boat-shaped caterpillars, leaf-worms, leaf-hoppers and other pests also tends to increase. Apple rot and root rot also entered the second peak of the year in late August. In drought years, spider mites still have the potential for outbreaks. Therefore, the apple orchard farmers in August should control these pests and diseases.
Phased prevention and control of pests and diseases
Ma Zhifeng reminded farmers that from August onwards, fruit growers should pay attention to spraying a fungicide once every 10 to 15 days for the orchard, and they could use systemic fungicide such as 3% polymyxin or 52.5% carbendazim carbendazim. Or 16% isoformimicarb or 12.5% ​​diniconazole or 25% myclobutanil or 25% propiconazole, etc., and alternately spraying protective fungicides and systemic fungicide, protective fungicides such as DuPont Bao, Pike, Dasheng, etc.
In August, the high temperature and drought, farmers should pay close attention to the occurrence of leafhoppers, gold moths, pear nets. Can be sprayed 1 to 2 times 10% fenbutatin oxime or 1.8% avermectin or 50% chlorpyrifos EC or 20% thioresulfuron EC to control.
In late August, we must carefully inspect for rot disease, timely cure rot disease, and disinfection protection. Trunks and grasses are trapped to kill the hidden winter fruit pests.
Topdressing phosphorus and potassium fertilizers to promote coloration
From the beginning of August to fruit coloring period, fruit growers should pay attention to the topdressing of foliar fertilizers mainly phosphorus and potassium fertilizers to increase the accumulation of sugar in fruits and promote fruit coloring. Currently, it can be used in combination with sprays to spray 3 to 4 0.5% potassium dihydrogen phosphates on the front and back sides of the leaves, which is beneficial to the coloring of fruits of medium-maturing varieties, increasing the sugar content, enhancing the resistance to transport, and favoring the expansion of fruits of late-maturing varieties. quality. In addition, it is also possible to apply phosphorus and potassium fertilizers to the soil, which will help to promote flower bud differentiation, inhibit excessive shoot growth, and prevent apple from falling before harvest.
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