The root cricket, also known as ground maggot, is a larva of onion fly. It is one of the most common and heavy insect pests on garlic. In the autumn, the root pods endanger the prosperous period. It uses larvae to feed on the bulbs of garlic and leaves the leaves yellow. The plants rot from the middle and the growth is weak. The prevention and control of garlic roots need to take comprehensive measures such as agricultural control, physical control and chemical control.
Agricultural control will improve the quality of soil preparation. Before the preparation, clean the garlic, onions, and stalks of the fields, the land, and the roadside. Fill the bottom of the soil with water, deepen the soil 30 to 40 cm, and plough the soil to level the land.
Use wheat stubble to grow garlic, not to be used in conjunction with onions and garlic crops, and generally use 3 to 4 years of crop rotation with non-onion and garlic crops.
Choose garlic, which is disease-free, harmless, and uniform in size, as a kind of garlic. The organic fertilizer must be applied after high-temperature fermentation and fully decomposed, and when basal fertilizer is used, deep-buried soil is isolated from the garlic.
Roots and wee are afraid of dry, around the roots of garlic, 150-200 kilograms of planting ash per acre, the control effect is better. Occurrence of land masses, flood irrigation once necessary, can reduce the occurrence.
Membrane coverage. The cover film should be careful to prevent the film from breaking, the seedling hole should be small, and the base of garlic sprouts should be covered with loose soil.
Physical control kills adults before laying eggs, and has a good control effect on root lice. In the adult stage of adult rootworm, use the ratio of brown sugar water, vinegar, and water in a ratio of 1:1:2.5 to form a liquid for killing, add sawdust and trichlorfon, mix well, put in pots, and place them in the garlic to put them in a trap. Adult insects.
At the same time, combined with watering, topdressing nitrogen and sulfur fertilizers that have a deterrent effect on the root carp can reduce the degree of damage. Before the period of garlic rotten mother stage, two times of ammonia water is applied to repel the adult rootworm.
When the chemical is used to control garlic sowing, 5% phoxim granules per acre are used, and 3 to 4 kg of mixed fine soil and 50 kg are spread in the sowing ditch. The healthy and disease-free kind of garlic was selected for the seed dressing treatment, and it was accompanied with the broadcast.
In the early stage of root larvae, per acre with 90% trichlorfon 800 ~ 1000 times, 300 ~ 400 times the ferrous sulfate, 48% Loessben EC 1000 times and other irrigation root control. The hydrocyclone on the sprayer head was removed and the liquid was injected into the root soil once every 10 days. The control was performed 2 or 3 times according to the occurrence of the root canal.
In the period of root tip adult emergence, use 2.5% diuretic powder 1.5-2 kg per acre, or use 40% dimethoate EC 1000 times to root, once every 7 days, continuously control 2-3 times, to 9 am ~11 when the best effect of spraying.
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