Disease and Pest Control of Glycyrrhiza uralensis
The main results are as follows: (1) after the rust was invaded by fungi, a yellow-brown blister spot appeared on the back of the leaf, which was broken and distributed brown powder, which was the winter spore pile and compound spore of the pathogen, and the brown-black winter spore pile was formed in August and September.
Prevention and treatment: concentrate the diseased plants and burn them. Initially spray Baume 0.3-0.4 degree stone sulfur mixture or 97% dimethylidene sodium 400 times.
(2) after the brown spot was infected by fungi, the leaves produced round and irregular disease spots, the center was grayish brown, the edges were brown, and there were gray-black mildew on both sides of the disease spots.
Prevention and treatment: concentrate the diseased plants and burn them. The initial spray 1:1:1-160Bordeaux liquid or 70% methyl topiramate wettable powder 1500-2000 times.
(3) after powdery mildew was infected by half-known bacteria in fungi, powdery mildew was produced on both sides of leaves.
Control method: spray Baume 0.2-0.3 degree stone sulfur mixture.
(4) aphids are also called honey worms and greasy worms. Adult and nymphs suck sap from stems and leaves, causing them to turn yellow when they are serious.
Control method: clear the garden in winter and bury the plants and fallen leaves deeply. Spray 50% fenitrothion 1000-2000 times or 40% dimethoate EC 1500-2000 times or 80% dichlorvos EC 1500 times every 7-10 days for several times in a row.
(5) the red spider occurred around August, and the damage was serious around September, mainly eating leaves and inflorescences. After the leaves were killed, the color of the leaves changed from green to yellow and finally withered. This insect is mostly hidden on the back of the leaves.
Prevention and treatment: 0.2-0.5 degree stone sulfur mixture can be sprayed with rice soup or flour paste water.
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Pest control of licorice
(1) leafhopper: there are mainly elm leafhopper, small green leafhopper and so on. It occurs in the whole growing period of licorice, and the damage is the most serious from late June to mid-August. When nymphs or adults suck the leaves, buds, young branches and buds of licorice, they first show silver spots, then the leaves lose green and show light yellow, and finally fall off. Control method: remove the elm and other leafhopper overwintering hosts around the licorice field. The peak of the damage was prevented by spraying 2.5% deltamethrin 1000Mel 1500 times. Use grass aphids, ladybugs, etc.
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Integrated control methods of licorice insect pests
The insect is a leaf-eating pest of the subfamily Chrysomelinae, which is very harmful to licorice and is one of the main obstacles to the development of licorice production. The insect is distributed in different degrees in Hexi region of Gansu Province and Glycyrrhiza uralensis producing areas in Liaoning Province. It mainly harms Sweet Glycyrrhiza uralensis but not other Arbor, shrub and grass plants. In the whole growing season, the damage of adults is mainly caused by adults, and the food intake is large, and the damage of adults and larvae often overlap. Prevention and control methods: some experiments have shown that dichlorvos emulsion
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