What are the hazards of walnut fruit? Walnut fruit can also be called walnut long-legged weevil, which is mainly caused by larvae, and there are obvious spawning holes on the damaged fruit. The larva breaks into the fruit-harvesting kernels, causing the fruit to be filled with reddish faeces and the fruit becomes empty, resulting in low commodity value of the walnut. Walnut fruit like adult insects bite the buds, causing the buds to wither and fall off, forming the shoots the next year, seriously affecting the yield of walnuts. Therefore, today Xiaobian will simply talk about the occurrence of walnut fruit and the prevention and control measures, I hope to help everyone. . First, the morphological characteristics 1, adult The body length is 10-12mm, the black and brown is slightly lustrous, the head tube is thicker, the tentacles are longitudinally grooved, the front chest plate is densely covered with black knob-like protrusions, and the coleoptera has obvious strip-like longitudinal bands, and the sheath wing base is obviously convex forward. Out. 2, eggs 1.2-1.4mm long, oval, yellowish white at birth, yellowish brown before hatching. 3, larvae The mature larvae are 14-16mm in length, with a brownish head and a yellowish part. The whole is curved like a sickle. 4, 蛹 It is about 12mm long and is milky white at first, then turns yellowish brown. Second, the law of occurrence The larvae, which occurred in the middle of April and May, were mainly fed with seed kernels before hardening, and caused a large number of fruit drop from June to July. Most of the larvae that occurred in June and July were fed in the mesocarp, and began to sputum in late June. After the emergence of the adult in July, the buds were eaten on the trees, and the place was found to be wintering. Third, prevention measures 1, injection In the end of April, the topsoil of the trunk roots was opened, and the main roots with the same extension direction as the main branches of the trunks were selected, and 1-2 holes were drilled with a carpentry drill having a diameter of 1.50 m to remove the wood chips in the holes. According to the diameter of the trunk, select the appropriate concentration of liquid medicine for injection, and then seal the hole with cotton balls and cover the soil to facilitate wound healing. The second injection was performed one week later. 2, crown spray The adults were sprayed and controlled during the peak period, spawning period and larval hatching period. The best agent was 40% Lecyanine EC 3000 times and 2.5% Kung Fu emulsion 2000 times. The control effect was over 85%. 3, artificial killing Pick up the fruit on the ground in time, remove the damaged fruit from the tree, and concentrate on the larvae, mites and unfruited adults. Vibrate the trunks during the adult period, lay plastic sheets under the trees, collect and treat the adults. 4, deep digging tree trays in winter to remove weeds and shrubs, and spray the ground with 0.5kg of phoxim to 50-100kg of water to kill the overwintering adults in the soil. For the wonderful pictures and popular comments on the prevention and control of walnut fruit, you may be interested in the following recommended contents. Welcome to read. Food Flavorings ,Dry Golden Onion Powder,Organic Onion Powder,Black Garlic Powder Shanghai J.Shine Co.,Ltd , https://www.jshinechem.com
