Continuous high temperature and drought, kiwifruit orchard plant leaves often occur more common dry defoliation. In particular, the longer the duration of high temperature above 35 degrees, the heavier and heavier, which has a serious impact on the vigor and yield of kiwifruit, and should be controlled according to the causes.
Physiological control of dry deciduous disease
Scientific irrigation depends on timely and reasonable irrigation in the rainy season. In the early morning, if the leaves are not wet, it is necessary to timely inject water to ensure that the orchards do not lack water.
Strengthen the cultivation and management to pay attention to scientific and rational application of soil and fertilizer water in kiwifruit garden, cultivate strong tree vigor, and improve tree stress resistance.
The orchard selects green plants such as shamrocks and wool pods to grow in the rows, lowering the ground temperature, raising air humidity, improving microclimate conditions in the orchards, alleviating summer heat hazards, and reducing leaf burns.
The tree tray covers the uncultivated orchard, and can be covered with wheat straw, wheat bran, corn stalk, etc. The thickness is 10-15 cm and a small amount of soil is pressed on. Weeds on the ground should not be cleared away. If the growth is too high, we can cut and cover the tree. Coverage can reduce ground temperature, increase soil organic matter content, and increase tree growth potential.
The rational load of strict sparse buds and thinning fruit, pay attention to leaf to fruit ratio of 6 to 8:1, reasonable fruit. Three-and-four-meter rows are planted around 480 orchards in mature gardens, and the yield per mu is controlled between 2200 and 2500 kg, avoiding excessive fruiting and leading to tree nutrient deficiency.
Reasonable summer shear season to pick the heart in time, cut off the invalid leaves, so that the orchard has good ventilation and light, and the branches and leaves grow robustly.
Control of Pest and Disease Harmless Dry Leaves Disease
Brown spot and black spot can be sprayed with 12.5% ​​tebuconazole WP3000-4000 times or 10% difenoconazole WG6000-7000 times solution; Hawthorn red spider and two-spotted spider mite can be used 15% phoenix EC1000 -1500 times, 25% buprofezin EC 1250-1667 times, 1.8% avermectin EC3000-4000 times or 24.5% Avery mineral oil (White Wit) 1000-1500 times spray control. Spray once every 15 to 20 days. The spray should be carefully and evenly. Note that the use of medicaments should be alternated to prevent the germs from developing resistance. During the high temperature period, pay attention to heatstroke prevention and poisoning accidents, and avoid the occurrence of phytotoxicity incidents.
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