First, the distribution of walnut limb moths: widespread distribution throughout southern Shaanxi. Damage situation: The larvae eat fruit from June to August, making the fruit black and early fall off (commonly known as black eggs), and it is the main pest that affects the city’s walnut yield and quality. Its occurrence is directly proportional to the degree of desolation under the tree. . Control methods: 1. During the winter and April of the following year, the soil reverts to the soil under the trees and clears the weeds and litter to prevent the insects from being destroyed and reduce the source of overwintering insects. 2. Pick and drop fruits and collect black fruits before mid-June, and collect them deeply to eliminate pests within the fruit. 3, in the mountains or inconvenient to take the first two methods of prevention and treatment of the place, in the wheat wheat slightly yellow, every 10 days, continuous secondary spray of 2.5% emulsion of emulsion or kung fu emulsion 3000-5000 times to Insect protection. Second, the distribution of walnut small giardia: There are distribution throughout southern Shaanxi. Injury characteristics: larvae mainly foraging 1-2 years old branches, turning into a spiral phloem in the phloem, cut off nutrients and moisture transmission, resulting in dry shoots and saplings of death, is a major impact on the city's walnut tree growth and results of the main pests one. Control methods: The most economical and effective way to prevent and control this worm is to cut off dry sticks (with a little stick of live twigs) between mid-April and mid-May, or when the fruits are harvested, and burn them to destroy the shoots. Pests. Third, the distribution of aromatic carpenter moths: There are sporadic distributions throughout southern Shaanxi. Injury characteristics: larvae feeding damage to the walnut neck cortex and xylem, the tree vigor was weak after the victim, the leaves withered, the whole plant died in the following year. Control methods: In July and August, apply a 2.5% emulsion of 300-500 times the emulsion of the walnut larvae at the invasion hole to kill young larvae. 2. When the larvae enter the xylem, first cut the root and neck soil, remove the insects in the hole, and then use a syringe to inject 80% of the dichlorvos emulsion 50-100 times into the wormhole; you can also use a poisonous cotton ball that dips dichlorvos Block the wormholes and seal them with wet soil to kill the larvae in the xylem. Fourth, ginkgo eggs moth distribution: Zhenan, Surabaya part of the township. Injury characteristics: Ginkgo larvae are large, larvae eat walnut leaves, often can eat the whole tree walnut leaves vanished. Control methods: Do three things: First, use a small hammer or axe to exterminate the eggs before the beginning of April; and secondly, spray the 40% dimethoate emulsion to the trunk and the crown of the insects in the young larvae, and 90 % Dipterex crystal 1000 times or 2.5% emulsion liquid 3000-6000 times; third is 7-8 months to remove insects and focus on destroying insects. (Shangluo City Forestry Pest Control Quarantine Station)
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