The summer walnut fruit enters the hard core period, and the management focus should be on the spray application. The specific measures are as follows:
First, spraying insecticides: In July and August, it was the stage of walnut insect pests. The fruit of the pest was walnut extremities. When the larvae licked into the fruit, the green skin was shed with white water; a week later, a pinhole was visible. The size of the dark brown dots, followed by a brown traces and depressions, often referred to as "black walnut", "black walnut." It can be started from the hard core of the fruit, and it is sprayed with 5% kungfu in 2000 times, or 2.5% for 3,000 times 2 or 3 times. The fruit is shot down in time and the peel is peeled off. Incineration.
The yellow-spotted moths, green thorn moths, and wood-footed moths, which damage the leaves, also took place one after another. Prevention of limb moths in July and concurrent treatment of other pests; single spray of 50% dichlorvos emulsion at the beginning of August; 1500 times; in the middle and late August, the trees were tied on the trunk and stone tiles were piled under the trees to trap overwintering pests. Kill.
Second, fertilization promote fruit promotion flower: Walnut fruit contains high fat, hard core period can be dug in the underground ring groove chase fertilization material, fertilizer to phosphorus, potash fertilizer-based, this is conducive to the fullness of the seed and flower bud differentiation, the results of the tree Can be applied to plant ash 2-3 kg, or 1 kg of superphosphate, 0.5 kg of potassium sulfate, or 1~1.5 kg of special compound fertilizer for fruit trees. Top dressing should be done before rain or after rain.
The type and concentration of foliar spray fertilizer are: urea 0.3%~0.5%, superphosphate 0.5%~1%, potassium sulfate 0.2%~0.3%, ash leaching liquid 1%, boric acid 0.1%~0.2%, ammonium molybdate 0.5 %~1%. The spraying time should be selected before 10 o'clock in the morning or after 3 o'clock in the afternoon so as not to cause phytotoxicity due to excessive temperature. Rainy days or windy days try not to spray.
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