Banana weevil, also known as borer weevil, often appears during banana growth. In severe cases, the injury rate of banana plants is as high as 60%-90%, which seriously reduces the planting benefits of farmers. Therefore, farmers must take timely measures to prevent it. This paper will make a detailed summary for everyone for farmers' reference.

Harmful symptoms:

Larvae mainly harms the stem base and bulb of banana plants near the ground, resulting in criss-crossing tunnels between the stem base and bulb. After the young plant is damaged, the whole plant shrinks, the aboveground part can't get enough nutrients, the growth and development are hindered, the leaves germinate slowly, the disease resistance is poor, and it is easy to be infected with mosaic heart rot and bunchy top disease, and the leaves turn yellow and wither until the whole plant dies; The adult plant is damaged, the growth is weakened, the leaves are premature, the ear cannot be headed or the fruit ear is small, and the banana fruit loses its green leaves before it is mature and full. The grown banana fruit is small, slender, low-grade and has no commercial value. The badly damaged plant bulbs turn black and rot, and they are prone to lodging when encountering strong winds. There are many banana orchards with poor cleaning, extensive management and untimely control, and most newly planted banana orchards are spread by banana seedlings with insect bulbs or buds.

Occurrence law:

Adult weevils generally live in groups in the outer sheath of banana pseudostems and only move at night. Banana weevils are resistant to low humidity, and die in 2-3 days in low humidity environment, with 4-5 generations a year. Larvae occurs from March to June, and the damage is the most serious from May to June.

Prevention and control methods:

Due to the poor control effect of chemical agents on banana weevil, it is suggested to control banana weevil manually and do a good job of cleaning and sanitation.

1. Cut off diseased plants in time after banana harvest, cut off rotten leaf sheaths around false stems in summer and autumn, and artificially catch adults and larvae.

2. Because of the strong drug resistance of weevil adults, chemicals should be selected for control in larval stage. Tea bran powder can be controlled at the petiole of banana.

3. When weevil is seriously damaged, 18% insecticide 1800~2000 times solution or 48% chlorpyrifos EC 1000~2000 times solution can be selected and sprayed on the lower part of banana leaf sheath in the evening.