Damaging borer of cashew tree trunks, roots and branches
19/01/2022
MSc Huynh Kim Ngoc The trunk and branch borer is a type of longhorn beetle, with a year-long life cycle, the borer penetrates the trunk, causing serious damage on old, thickly planted, densely planted cashew gardens with little care. There are two types of trunk borers: + The trunk borer is a longhorn beetle, the female insect lays eggs in the cracks in the bark, about 1.5 meters down from the trunk, then the worm eats the soft bark and then drills deep inside to form zigzag tunnels. where drilled site shows extrusion of excrement and sawdust out , when the borer makes a circle around the trunk, then saptube is cut off, the tree dies and dries up. Pests focus on July to September of the year. + Branch borer is also a type of longhorn beetle but has a black color, the female lays eggs on the flower buds, dry shoots, the newly-hatched larvae drill tunnels from the top of the buds to the large branches below, making the branches dry and brittle when carried. heavy fruit or heavy rain or strong wind.
Preventive measures: Because the stem borer bores deep into the trunk and branches, it is very expensive and ineffective to use products, so it is necessary to visit the garden regularly for early detection and timely prevention. It is necessary to apply integrated measures such as: + Planting sparsely. + Pruning branches, creating canopy: Pruning branches in the canopy, ineffective branches, branches close to the ground, dry branches to help open the canopy, pruning twice a year, the first time after harvest: April, fertilize in phases 1, 2nd: Around September, fertilize the 2nd phase. Branches after pruning, collecting and destroying to control larvae or pupae are still inside. + Use light traps to catch adults to limit egg laying, traps are set between March and April, lighting time is from 6pm to 6am the next day. + Early detection of newly-drilled worms, using hands to catch larvae, pupae, eggs, harmful branches should be sawed and destroyed. + Lime or apply Bordeaux solution to the base or mix insecticides such as Sairifos 585 EC or Diaphos 50EC with slurry in a ratio of 1:4 and sweep it up to 1.5 meters above the ground at the beginning of the dry season to prevent worms from laying eggs into the base. + Spray with systemic products or fumigants such as Diaphos 50EC, Sairifos 585EC, Lancer 50SP to repel in the adult stage (April - June) or kill newly hatched caterpillars. If the density is very deep, spray once every 15-20 days. + If the worm has penetrated deep inside, you can use zinc or a knife to open the mouth wide and then use a syringe to inject insecticide or put a few seeds of Diaphos 10G or Sargent 6G in the mouth of the hole... then use clay. close the hole.
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