Stop mistake the leaf-dwelling beetle for a leaf-diving moth
See Figure One, what are your first reactions to the harmful symptoms of the disease and insect?
(Figure 1)
If your answer is "leafminer moth", then please continue to look at Figure 2, what is this pest?
(Figure 2)
Are the two pictures very similar? The answer to Figure 1 is "leaf diver moth", congratulations, the answer is wrong! In Figure 1, the leaf-diving beetle is the real culprit, and this time the leaf-diving moth (Picture 2) has carried a black cauldron.
Comparing the two pictures carefully, we will find that the spiral worm path formed by the leafminer moth larvae is narrower, the worm path is slightly white and shiny, the insect path formed by the leaf carapace is wider, and the excrement is a thicker black line. And we recall that in the past, when it was harmed by leafminer moth larvae, the leaves would be severely twisted and hard and brittle, but they would not fall off quickly, and the leaves would easily fall off if they were harmed by the leaf-based moths.
After talking about the difference between the two, it is time to reach today's protagonist, Qianye Jia. Leaf-deep beetles, also known as leaf-breaking beetles, orange leafminers, red dog insects, poor management, bark cracks and lichen moss-rich orchards, are conducive to pests in summer and overwintering, and are particularly prone to leaf-based beetle infestation in the spring.
Adult: Oval, orange-red back, head, forebreast, dorsal plate, feet and a pair of antennae are black.
Eggs: oval, yellow, with hexagonal or polygonal reticulated stripes on the surface.
Larvae: whole deep yellow. Foreorthoraxal dorsal plate hardened.
Pupae: pale yellow to dark yellow with a yellowish brown tail. The head is bent towards the abdomen, and there are many pairs of bristles on the body.
The latent leaf beetle is mainly harmful to spring shoots, and is harmful to the young shoots and young leaves of citrus. After hatching, the latent leaf beetle larvae burrow into the leaf to feed on the leaf flesh, forming an irregular spiral curved worm path. Adults first feed on the leaf surface, leaving only the epidermis or reticulated veins, and the leaves appear white spots.
【Life Habits】
In South China, there are 2 generations a year, and 1 generation in Zhejiang, with adult insects overseating and overwintering in the loose soil under bark cracks, lichens, mosses and around the trunk.
From late March to early April, spring shoots germinate and overwintering adults begin to scatter their eggs on the back and edges of young leaves, feeding on leaves or old leaves, biting the leaves into holes. Adults are mainly active in groups during the day, are good at flying and jumping, and have a suspended animation.
April to May is the infestation period for larvae, and the larval stage is 12 to 24 days. After hatching, the larvae bite through the epidermis of the leaf, burrow into the leaf to feed on the leaf flesh, forming a curved worm path, and then leaving a black excrement in the middle of the worm path, which looks like a black line. In severe cases, it can lead to yellowing of leaves, decay and shedding, and bald branches in spring.
In late April, the larvae fall with the leaves as they mature, and soon the bite hole comes out, burrowing into the loose soil about 3 cm deep around the trunk, ready to pupate.
Late April to late May is the pupal period, from early May to early June, it can feather adult insects, after 10 days, adults feed, and gradually sneak into the wintering place to overwinter and overwinter. The average lifespan of adult insects is generally 235 to 248 days, that is, about 8 months.
It is early April, and adult leaf-diving beetles have begun to lay eggs, and growers should seize the current opportunity to control it.
Since adults overwinter in the loose soil around bark cracks, lichens, mosses and trunks, it is necessary to remove lichens, mosses and weeds in the garden in time in winter and spring to kill overwintering adults. During the spring larval occurrence period, the diseased leaves are removed in time and the fallen leaves on the ground are removed, and the larvae that want to pupate are eliminated. During the pupal stage of larval pupalization, the soil is loosened and the pupae are killed. Spray control in the first stage of larval occurrence and the recovery period of overwintering adults, recommended agents: high-efficiency cypermethrin, imidacloprid, cypermethrin, cypermethrin, etc.
Article Source: Da Tangerine Dali He Wenzhong /Sasha
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