First, the conditions of occurrence:
At present, most of the rice seedlings are in the slow seedling stage, the bottom leaves and the water surface contact time is long, and the leafminer fly is generally prone to occur in the 4-6 leaf stage after rice planting, the pest is more harmful to the 4-6 leaf stage after rice planting, if it is not found in time, it expands from local occurrence to whole field occurrence, and the prevention and control will not develop from individual plant death to the whole field in time, due to the leaf chlorophyll being sucked and dying.
When we plant seedlings, some seedlings are weak, the leaves are not firm, so that the leaves float on the water surface or after planting, due to rainfall, farmers are reluctant to drain, resulting in the water layer is too deep to flood the seedlings or uneven fields, and the water layer in low-lying areas is too deep, which creates conditions for leafminer flies to spawn and occur.
How are leafminers controlled this year?
Leafminer fly, every year has a different degree of occurrence, this year the insect population density is very large, the harm is serious and long duration, so this year is the leafminer fly large occurrence year! Because leafminer flies occur in large numbers, unlike in previous years, it is easy to eliminate leafminers with a little potion!
The amount of drug application for the prevention and control of leafminer flies should be sufficient, the dosage should be 1.5-2 times the amount of prevention, if you use it according to the conventional amount, you can't kill the insects! The method of controlling leafminer fly application should be correct, must be foliar spray, and shallow water should be withdrawn, 1 pot of water can go up to 2 acres of land, if you mix fertilizer or soil as in previous years, or stand on the edge of the pond to flow, it is impossible to eliminate leafminer flies!
If the insect is on the leaf surface, choose high chlorine and other touch killing effects, but the leafminer fly is inside the leaf, not on the leaf surface, so choose an insecticide with systemic suction, gastric poisoning and touch killing function.
Where the water layer is deep, the leafminer fly is seriously harmful, because the insect eggs live in the water, the water depth, the leaves are in the water, the insect eggs directly drill into the leaves, bite the leaf flesh, and soon the leaves are only white leaf epidermis, so the water depth is very vulnerable to leafminer fly hazards, therefore, the requirements of the tillering period shallow water irrigation, the water layer 3-5 cm, remember to irrigate deep water! We must pay attention to drainage, maintain shallow water layers, and do not create conditions for leafminer flies to occur!
Prevention and control methods:
1. The water should be flat, so that no inch of water is exposed to mud, so that the depth of the water layer of the whole field in the later period can be guaranteed.
2, in the rice 6 leaves before the water layer irrigation should not be too deep, flowers can reach the water, not to mention the water, in the first 3, strengthen the prevention and control of agents. Early prevention in the initial stages of leafminer larvae, Avi. Chlorpyrifos mixed with water mist machine spray, can also increase the dose of medicine to apply prevention and control. For the getian that has been infested by leafminer flies, it is necessary to prevent and control it in advance, and routinely control it 1-2 times.