What should be paid attention to for the prevention and control of mango leaf gall mosquito?

Mango leaf gall mosquito control method.

1. Mango leaf gall mosquitoes like warm and humid climate and shady environment, so attention should be paid to pruning the crown and keeping the orchard ventilated and light-transmitting; Species with a more consistent planting stage or chemical control shoots should be selected to avoid alternate extraction of new shoots to provide continuous food for gall mosquitoes; Timely clearing of the garden and loosening of the soil to destroy its pupation site.

2. When 3-5 cm is extracted from the young leaves of the new shoots of mango, choose 20% pyrethrin EC or 10% cypermethrin EC or 25% dimethrin EC 2000-3000 times 40% dimethoate EC plus 90% trichlorfon crystals 600 times each or 40% hydroamidophos EC and chlorpyrifos (Lesburn) EC 1000-1500 times liquid foliar spray, the application interval is 7-10 days, 2-3 times per shoot period, the application should be even, and the ground in the crown drip line should be sprayed in spring.

3. Before the arrival of spring rain in February and March every year, 4-5 kg of 3% isosulfonate granules plus 20 kg of fine sand or mud powder per mu, evenly sprinkled on the soil surface within the drip line of the canopy, and then covered with 2 cm thick mud powder, which can kill the larvae that enter the soil and the adults who will emerge in spring.

Spray 40 dimethoate EC 1500 times, 90 dimethoate 1000 times or 25 insecticidal double 500-800 times solution at the tip extraction stage, spray 1 time in 7 days, spray 2-3 times in a row. For any planting problems, you can refer to this bumper harvest agricultural materials**.

Prevention and control methods of leaf gall mosquitoes: Implement seedling quarantine to prevent such pests from entering the new area.

Strengthen orchard management and strive to draw neat shoots. Do a good job of pruning and pruning, keep the garden ventilated and light, often weed and loosen the soil, clear the garden in time before winter, and eradicate the breeding and breeding places of gall mosquitoes or pupation.

Pesticide application for prevention and control. Spray the leaf gall mosquito to grasp the tender shoot stage [that is, within 7 days of the summer and autumn shoots (before the bronze young leaves turn color)] spray 1000 times of 25% quinthion EC or 1000 times of 50% dimethoate EC, and spray 1 2 times. You can also choose dichloride emulsifiable concentrate, or 25% methaco emulsifiable concentrate, or 20% rapid pyridine emulsifiable concentrate 3000 4000 times liquid.

To spray the gall mosquito, you can master the application of 50% phoxanthion EC 1000 1500 times liquid at the early flowering stage, and spray 3 4 times in a row.

1) Strengthen cultivation management, promote the growth of plants, neat shoots, and reduce harm.

2) In the early stage of emergent emergence, overwintering adults should be sprayed with 50% phosphine milk macro-like oil (used for clearing the garden in winter and spring).

3) When the young leaves of the new shoots are extracted, spray the crown with 20% pyrethrin EC (or deltamethrin EC) 2000 3000 times or 40% dimethoate EC and 90% trimethrin emulsifiable concentrate 600 times each. Spray once every 7 10 days, 2 3 times per shoot stage.

1. Mango leaf gall mosquitoes like warm and humid climate and shady environment, so attention should be paid to pruning the crown and keeping the orchard ventilated and light-transmitting; Species with a more consistent planting stage or chemical control shoots should be selected to avoid alternate extraction of new shoots to provide continuous food for gall mosquitoes; Timely clearing of the garden and loosening of the soil to destroy its pupation site.

2. When 3-5 cm is extracted from the young leaves of the new shoots of mango, choose 20% pyrethrin EC or 10% cypermethrin EC or 25% dimethrin EC 2000-3000 times 40% dimethoate EC plus 90% trichlorfon crystals 600 times each or 40% hydroamidophos EC and chlorpyrifos (Lesburn) EC 1000-1500 times liquid foliar spray, the application interval is 7-10 days, 2-3 times per shoot period, the application should be even, and the ground in the crown drip line should be sprayed in spring.

3. Before the arrival of spring rain in February and March every year, 4-5 kg of 3% isosulfonate granules plus 20 kg of fine sand or mud powder per mu, evenly sprinkled on the soil surface within the drip line of the canopy, and then covered with 2 cm thick mud powder, which can kill the larvae that enter the soil and the adults who will emerge in spring.

Mango gall mosquito belongs to the family Diptera gall mosquito. It is distributed in Guangdong, Guangxi and other Jianji provinces (autonomous regions). The larvae damage young leaves, shoots, petioles and main veins.

The damaged leaves are brown spots, perforated and cracked, the leaves are curled and bridged, and the leaves are wilted, falling off and even the shoots are withered in severe cases, resulting in poor plant growth and infiltration.

In Nanning, 15 generations occur in a year, and each generation lasts for 16 to 17 days, including 2 days for the egg stage, 7 days for the larval silver cluster stage, 5 6 days for the pupal stage, and 2 3 days for the adult stage. It can be found in the field in early November every year, and after mid-November, the larvae successively enter the soil to pupate at a depth of 3 5 cm and overwinter. It was unearthed around the beginning of April of the following year.

The adult emergence time is 15 to 18 o'clock in May and August, and 9 to 10 o'clock in September and October. Adults begin to mate on the night of emergence, and the peak period is at night (21 to 22 o'clock). Spawn is laid the next morning.

Adults have a short lifespan, males die on the next or third day after mating, and females die on the second or third day after egg-laying. The eggs are scattered on the back of the young leaves, and after the eggs hatch, the larvae bite through the epidermis of the young leaves and burrow into the leaves to feed on the mesophyll. Severely damaged leaves break in an irregular network to die and fall off, and then the old larvae bite through the epidermis and crawl out of the leaves, bounce or pupate with dew into the topsoil.

1. Agricultural measures. Combined with winter pruning, prune the branches and leaves of the overwintering gall, and burn them intensively to reduce the source of insects.

2. Sprinkle poisonous soil. When the first adult is mastered, 7500 ml of 50% phoxanthion emulsifiable concentrate is used to prepare poisonous soil per hectare and sprinkle on the ground of the whole garden to kill the adults who have just emerged. The use of phosphine should be covered with soil after application to avoid photolysis failure.

3. Drug prevention and treatment. Orchards with serious damage, if necessary, can be sprayed on the crown of 25% water amidophos 1000 times, or 90% trichlorfon 800 times, or 25 insecticidal double emulsifiable concentrate 500 times plus laundry detergent, drain the ridge every 7 days once to the new shoots turn green, these anti-laughing and infiltrating agents can be used cross-use.

4. Biological control is sold. During the non-pumping period of lychee, it is important not to blindly spray the drug so as not to accidentally kill the natural enemies, such as the lychee gall mosquito red-eyed queen wasp has a greater effect on inhibiting the population of the insect.