What are the control methods for mango weevil infestation?
1. The mango leaf-cutting weevil is widely distributed. Adult beetles feed on tender mango leaves, causing the leaves to dry up; or the female lays eggs on tender leaves and bites the tender leaves off at the base, affecting plant growth. Control methods: ① During the period of new shoot growth, pick up the bitten-off fallen leaves from affected plants once every 3 days, dry them in the sun and burn them to kill the larvae;...
1. The mango leaf-cutting weevil is widely distributed. Adult beetles feed on tender mango leaves, causing the leaves to dry up; or the female lays eggs on tender leaves and bites the tender leaves off at the base, affecting plant growth. Control methods:
① During the period of new shoot growth, pick up the bitten-off fallen leaves from affected plants once every 3 days, dry them in the sun and burn them to kill the larvae;
② During the new shoot growth period, spray once every 7 days; 40% dimethoate emulsifiable concentrate at 1500 times dilution, 90% trichlorfon at 1000 times dilution, 25% bisultap at 500-800 times dilution and 2.5% deltamethrin at 2004-3000 times dilution are all effective.
2. The fruit mango weevil and the flesh mango weevil. The former is a small beetle about 7 mm long and black. Its larvae bore into and feed on mango seeds, affecting fruit quality; the flesh mango weevil is a smaller yellowish-brown beetle than the fruit mango weevil, and its larvae mine the flesh, forming tunnels filled with frass, making the fruit unfit to eat. These two pests occur mainly in Yunnan, Vietnam, Cambodia and as far as Indonesia, and are quarantine pests. However, it has been reported that in recent years this pest has been found in the border area between Guangxi and Yunnan. Because these two pests cause serious damage but occur only in limited areas, quarantine must be strengthened to prevent their spread to new areas. In recent years, the practice of transporting large quantities of mangoes from Vietnam through unofficial channels without quarantine is dangerous.
Control methods:
① In areas where this pest has not been found, strictly enforce the quarantine system to prevent its spread to new areas;
② In infested areas, maintain good orchard sanitation, promptly pick up fallen fruit and poison them in a centralized manner;
③ In autumn and winter, combine orchard clearing with the removal of all weeds, carry out fine deep plowing, and eliminate pests overwintering in cracks in the soil layer;
④ During the young fruit stage 30-45 days after petal fall, spray the canopy with a mixture of dimethoate, trichlorfon and water at 1:1:1500, spraying once every 7-10 days, for 3-4 consecutive applications, which can achieve significant control efficacy.
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