Recently, many citrus growers have reacted to the fact that their orchards have been invaded by an inexplicable insect, and after a small inquiry, it was learned that this stubborn insect is called a weevil.
harm
Weevils are heterogeneous, mainly adult insects eat young leaves, spring shoots, and young fruits. After the leaves are eaten, they are incomplete, the young shoots are eaten into grooves, and the skin of the young fruits is dented and scarred, resulting in falling flowers and fruits, causing serious harm to citrus.
Prevention and control methods
(1) Artificial hunting. Every year, after the Qingming Dynasty, there are more and more adult insects, manual capture, you can lay plastic film under the tree around noon, and then shake the tree, the adult insects are frightened and fall on the film, and kill it in a concentrated way. Catch every 3 to 5 days during the peak period.
(2) Rubber ring hunting. Before and after the Qingming Dynasty, the trunk of the tree is bandaged with a rubber ring to prevent the adults from going up the tree, and the adult insects that are blocked under the rubber ring are collected and processed at any time, and the rubber ring is removed after the adults are extinct.
The production of the rubber ring: first wrap about 16 cm wide cardboard (kraft paper, oil paper, etc.) around the trunk or larger main branch, then tie it tightly with hemp rope, and then coat the paper with sticky shellac. The formula of shellac is: rosin 3 kg, tung oil (or other vegetable oil) 2 kg, yellow wax 50 g. First heat the oil to about 120 ° C, then slowly add the crushed rosin, stir while adding, until completely dissolved, and finally add yellow wax to stir well, cool and set aside.
(3) Chemical control. In the adult excavation period, the following pesticides are selected to spray: during the adult excavation period, the ground is poured in the evening with 50% octyl thiophosphate emulsion 200 to 300 times liquid. When adult insects are harmed on trees, they spray 3,000 to 4,000 times the liquid of emulsion with 2.5% enemy killing emulsion, 90% of the crystals of the enemy insects, 800% of the borer pine, and 80% of the dimethoidal 800 times liquid.
The above method is for reference only
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