1. Banana weevil
Banana weevil
(1) Harmful symptoms
Adults feed on banana leaves and false stems, while larvae eat false stems and bulbs (banana heads); when the damage is severe, the insect tunnels crisscross each other, affecting plant growth and even causing plants to die. The affected plants have shrunken leaves and turned yellow, with more dead leaves, fewer fruit, or the ears cannot be extracted, and in severe cases, the false stems decay or die.
(2) Morphological characteristics
Adults are black or blackish brown all over the body, with a waxy luster, and the head extends into a barrel and slightly curved downwards to form an elephant trunk.
(3) Solution
Scenario 1:
1. Implement banana seedling quarantine To prevent banana weevils from spreading with sucking seedlings, it is best to use test tube seedlings as planting materials to eliminate insect sources.
2. Qingyuan and artificial hunting Banana orchards should be cleared frequently and kept clean in the park. Timely dig up old stumps, old banana heads and circle bananas (that is, cut off dead leaves), and circle bananas once every 1 to 2 months before harvesting. Dried leaves and leaf sheaths that are infested with the insect should be buried deep or burned. Combined with Qingyuan, the object armor can be artificially hunted.
Scenario two:
Spraying or drizzling with 40.7% Lesben or 25% insecticidal double water agent 500 times liquid has a better anti-treatment effect on adult insects.
Scenario three:
Biological control Salamander is a natural enemy of banana weevils, which can burrow into banana stems to prey on their larvae and should be protected and utilized. Poultry are stocked in banana orchards to peck at the larvae and adults of banana weevils.
2. Banana butterflies
Banana butterfly
The larvae spit silk curl leaves into leaf buds, hide in them to feed on banana leaves, when severe, banana plant leaf buds are tired, banana leaves are incomplete, and even only the middle vein remains, hindering growth and affecting yield.
Male adults are dark brown or tea-brown. The cephalothorax is densely covered with gray-brown scales; the antennae are enlarged in a hook-shaped manner, and the proximal bulge is mostly white; the forewings are gray-yellow scales near the base, with 2 nearly rectangular macromachoids in the middle of the wings, and 1 nearly square small macula near the outer margin, and the anterior and posterior wing margin hairs are white. The ovoids are spherical and slightly flattened , with radial white lines on the surface of the shell , yellow at first birth , and gradient red. The larvae are covered with white wax powder ; the head is black and slightly triangular. Pupae are pupae, cylindrical, pale yellow, covered with white wax powder.
(1) Focus on eliminating overwintering larvae, carefully clean up the banana garden, and collect insect buds for centralized treatment.
(2) During the peak period of pest, it is also possible to manually remove insect buds or use small branches to beat down insect buds to concentrate on killing the larvae and pupae.
At the young age of mastering the larvae, the following agents can be used: 90% crystalline dimethoate; 40% hydroamine thiophos emulsion 1000 to 1500 times liquid; 5% urea emulsion 1500 to 2000 times liquid; 10% chlorohydropethrin emulsion or 2.5% bromethrin emulsion 2000 to 2500 times liquid; Thuringiensis powder (containing live spores 1x1010 /g) 500 to 1000 times liquid; 5% futaviron emulsion oil 1500 to 2000 times liquid; 2.5% cypermethrin emulsion 2500 ~ 3000 times liquid, foliar spray, kills larvae.