Malignant leaf beetles are mainly distributed in the southern provinces (districts) of China. They are the pests that harm citrus shoots and young leaves. The host plants are limited to citrus species, and no reports of damage to other plants have been reported. In 1998, when the author was investigating olive pests and diseases, he found that the malignant leafworm was very harmful to the olives, and the average insect density was 10 heads/tips, and the number of as many as 20 heads/shoots. Among them, hundreds of olive trees on the side of Xinde Primary School Xinyi Primary School in Gaozhou City and in Baiyun Mountain in Maopo Village, Xinyi Town were all eaten up, and olive granules were lost. Malignant leaf aphids became one of the main pests of the local olives. In 1999, the author studied the biological learning and control of the malignant leaf aphid-damaged olives. The results are summarized below. 1, morphological characteristics adults: adult body length oval, female body length 3 ~ 3.8 mm, male body smaller. Blue black, metallic luster. Antennae are brownish brown, with small engraved dots on the pronotum of the thoracic spine, and 10 rows of small engraved dots on the elytra. The brain ventral black, yellow-brown foot, hind leg expansion, abdomen ventral brown. Eggs: long oval, long diameter of about 0.6 mm, early white, shiny, later yellow-white, dark brown when hatching, egg shell outside a layer of tan-colored mesh mucosa. Larvae: The growth larvae have a body length of about 7 mm. The mature larvae have a length of 9 mm. The head is black and the chest and abdomen are yellow. The thoracodorsal plate is half-moon shaped. There is a vertical line in the center divided into two pieces. There is a black protrusion in the middle and back chest and black chest.蛹: Oval-shaped, approximately 2.7 mm long, yellow-white at first, later orange-yellow, with a pair of fork-like protrusions at the end of the abdomen, darker at the end of the fork. 2. Living habits In Gaozhou City, malignant leaf A occurred four generations a year. Adults in the trunk cracks, mold piles, rolling leaves, dead leaves winter. Observed. Most wintering occurs in withered leaf curls or spider leaf nests, and overwintering adults begin their activity in late February of the following year. The larval stage of each generation is from early March to early April, early June to late, middle August to early September, mid-October to early November. The first generation of larvae infested the spring shoots throughout the year, and the second generation was the most serious summer shoots, with very few occurrences after each generation. Autumn shoots and winter shoots suffer less. Adults jump well and have a feign death. Feeding is started 2 to 3 days after emergence. Female adults can copulate many times, and they lay eggs on the same day or the next day after mating. The eggs are produced in the frontal tips or leaf margins of the leaves. The females bite into small holes with mouthparts before spawning, and then produce in the hole. 2 eggs, and secrete coated egg surface. Larvae take young leaves after hatching. A total of 3 larvae are larvae. The mature larvae generally phlegm in the wilted leaf nests, but also in bark cracks or spider nests, lichens, and mosses. 3, damage characteristics Malignant leaf a larvae cluster damage, eat leaf meal, leaves veins. After being dispersed and transferred, the leaves will be licked along the leaf edge and the leaves will be eaten as engraved. After taking the leaves, the mucous body was excreted from the body wall. At the same time, the excreted strips were attached to the back with the tail upturned. There was a layer of black sticky material. The parasite was suspected to be a pile of insect excrement. It was actually a malignant leaf. larva. The larvae feed on tender shoots first. When the population density is large, the new and old leaves are eaten together. According to the survey, the trees above the age of 15 are more severe, and the small trees within the 10 years of age suffer less. This may be related to the management of olive groves: Orchard management is generally more extensive and old. There are bark cracks, lichens, and mosses on the trees, and there are more dead and clumps of underground branches. This provides a favorable place for the wintering of adults and larval larvae. The number of orchards occurred was serious and seriously damaged. 4. Control Methods (1) Clean Lavender. Remove mold piles, mosses, lichens and withered leaves, leaf curls, plug tree holes to clear overwintering and phlegm-removing sites. After the mold posts are cut off, wax or fresh cow dung and clay (1:1 mixture) are applied to the wound to protect the wound. Moss fresh, lichen sprayable turpentine mixture can be controlled. In winter, pruning, clearing the branches and leaves of pests and diseases, and removing the withered leaves and leaf curls at the same time. (2) spraying protection shoots, young leaves. Investigation of the larvae of the olive groves was conducted. When the larvae appeared, 90% trichlorfon 1000 times solution or 80% dichlorvos emulsion 1000 times solution could be used for spraying, which had a good effect. After the first spraying of the pests in the orchard, spray once more every 10 days.
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