Medicinal Plant Pests 榆金花虫
Galerucella maculicollis Motsch. The synonym of Pyrrhalta maculicollis (Motsch.) Coleoptera. Alias ​​榆 毛 毛 è¤ è¤ è¤ æ¦† 榆 榆 。 。 。 。 。 。 。 。 。 。 。 。 。 Distributed in the Northeast, North China, East China, Central China, Northwest.
Host eucalyptus.
Injury characteristics Adults feed on the buds of eucalyptus trees. The larvae turn the leaves gray to translucent reticular mesh points. In North China, it is often mixed and harmed by the mixed insects.
Morphological characteristics Adult body length of about 6.5-7.5mm, width 3-4mm, nearly rectangular, brown-yellow to dark brown, head of the center with a peach-shaped black markings. Most of the antennae, spots on the top of the head, three horizontal markings on the pronotum, middle stripe, small scutellum, shoulders, hind-thorax web, and both sides of the abdomen were dark brown or black. Short antennae, less than half of body length. The engraved wings are engraved on the elytra. The egg is about lmm long, long conical and blunt at the top. The last instar larvae are 9mm long and yellow, with black hairy tumors on the entire body. Black foot. About 7mm long, creamy yellow, oval, black bristles on the back.
Living habits Beijing is born 1-2 generations old, and adults spend winters under weeds or in building gaps. When the eucalyptus sprouts in early April of the following year, the overwintering adults begin to move and the eggs are laid on the leaves in late April. Incubation of larvae damages the leaves in early May.
Control methods (1) When mature larvae colonize the tree trunk, kill it in time. (2) The feeding period of the adult tree and the larval hatching period are promptly sprayed with 80% of dichlorvos EC 800 times or 2.5% of deltamethrin EC 2500 times.
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