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 easy to occur at the 4-6 leaf stage after rice planting, the pest is more harmful to the 4-6 leaf stage after rice planting, if found in time, from local occurrence to whole field occurrence, prevention and control will not develop from individual plant death to whole and whole field in time, due to 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.
Second, the 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 leaf fly prone period because of rainfall and deepen the water layer, must be discharged excess water layer.
3. Strong seedlings go to the ground to ensure that the leaves are firm and avoid the leaves floating on the water.
4. Strengthen the prevention and treatment of pharmaceutical agents.
We should pay attention to the fact that leafminer flies can only be prevented, and leafminer flies are winged insects, which should be mainly repelled and supplemented by touch killing. Pesticides with large odors: such as octylthion, trizophos, high chlorine, malathion and other prevention and control.
Due to the recent continuous low temperature weather, which has caused a certain growth impact on the growth of rice seedlings, it is recommended that at the same time as the medicine is sprayed together with the Israeli Nop Feng leaf fertilizer, it can prevent insects and lift seedlings and strengthen seedlings.
Attached: Teacher Zhou's summary of the "Three-Five Law of Insecticide" is for the reference of the majority of rice farmers and agricultural material dealers!
5 types of insects: hairy, with shell, with wings, with claws, nothing.
Insects exist in 5 parts: soil, root system, stem, leaf surface, air.
Insecticides 5 categories: touch killing, systemic suction, gastric poisoning, fumigation, exorcism.
Prevention and control techniques:
Aerial insects (generally winged) are repellents.
Soil insects (generally with shells) are used as fumigants.
Insects in the root and stem (generally nothing) are taken as an endoscopic agent.
Leaf surface insects (with claws or hairs) with contact killers or gastric agents.
Source: Rice in the world