Aristobia testudo voet, genus Coleoptera, family Acephalus.
【Host】Longan and other fruit trees.
[For pests] larvae moths the main trunk and branches, hatched larvae under the cortex to eat, and then moth into the xylem, forming a flat circular tunnel, every certain distance to bite a small hole and ventilate with the outside world and excrete feces. Affecting the delivery of water and nutrients, the tree is weakened, and serious branches are hollowed out, causing large branches to wither and even the whole plant to die. Adults bite the cortex of the branches, causing the branches to dry up.
【Morphological characteristics】 Adult insects are 20 to 35 mm long, long, the elytra are covered with orange-yellow patches, and there are more than ten black stripes on each elytra to surround the yellow spots into turtle shell-like patches; the antennae of female adults are equal in length with the elytra wings, and the antennae of male adults exceed the end of the elytra by 2 to 3 segments; the head, antennae, the first and second segments of the antennae, and the abdomen and feet are black; the third segment of the antennae is yellow and black, and the black is fluffy. The eggs are oblong, initially milky white, yellowish brown near hatching. Larvae Mature larvae are about 60 mm long, flat cylindrical, white with light red, yellow-brown dorsal plate of the anterior thorax, and have a yellow-brown "mountain" glyph; Pupae Naked pupae, initially milky white, black before feathering.
【Life Habits】Occurs once a year, and the larvae overwinter under the cortex or in the moth tract where the adults lay eggs. Adults are seen in early June, pupate feathers become adults from late June to mid-July, and adults commonly feed, cross tails, and lay eggs in orchards from July to August. Adults are more active from 8 to 11 a.m., often biting into the cortex and young leaves of the branches of the year, resulting in dead branches. At noon, it often inhabits the shade of the canopy and has suspended death. Adults lay eggs about 10 days after mating, and the eggs are scattered on branches with a diameter of more than 1 cm, and there are more branches with a diameter of 1 to 3.5 cm. Before laying eggs, bite the cortex to form a half-moon-shaped scar, the larvae hatch and eat under the bark, and live under the cortex of the half-moon egg-laying wound for about 4 months, growing slower. In the spring of the following year, it enters the xylem and forms a flat circular tunnel. The pit is bitten at intervals by a row of fecal holes and external ventilation, and insect feces are often visible outside the orifice. The larval stage is about 9 months. In June, the larvae begin to mature one after another, blocking both ends of the tunnel with dung and wood chips to form a pupal chamber, in which they pupate. Among the lychee varieties, the black leaves and concubines laugh were more seriously affected, and the double-widowed trees in the longan varieties were more seriously affected.
【Control method】 (1) From July to August, in the adult insect peak period, shake the branches, and the adult insects are suspended and collected and destroyed. (2) Cut off the dead branches after being killed, and burn them together with the larvae. Or find a half-moon egg laying scar on the bark, and hit the victim with a hammer to kill the eggs or larvae under the bark. (3) After the larvae moths into the xylem, 80% of the predators or 90% of the enemy worms are injected into 80% or 90% of the enemy hyacinths 50 to 100 times the upper orifice of the larvae in the upper orifice of the larvae, and then block the orifice to prevent the larvae from climbing up to poison the larvae in the moth channel. Or dip a cotton ball into the moth from the fecal hole and then seal the orifice with clay to poison the larvae.