The scientific name Criocris quaturordecimpunctata (Scopoli) is a Coleoptera, a nematode. Alias ​​leaf aphid, thin neck leaf A. Distributed in Heilongjiang, Jilin, Liaoning, Inner Mongolia, Beijing, Hebei, Shandong, Jiangsu, Zhejiang, Fujian, Shaanxi and Guangxi.
The hosts include wheat, cypress, and asparagus.
Injury characteristics, larvae feed on wheat stems or leaves, affecting wheat photosynthesis.
Morphological characteristics Adult long oval, adult body length of 5.5-6.5mm, southern body length 6.1-7.1mm, width 2.5-3.2mm, body brown or reddish brown, and black Spots, the front of the head, around the eyes, antennae are black, and the rest is maroon. Head with black spots, antennae ll section, short thick. The length of the prosthodontic plate is slightly larger than the width of the prosthodontic plate. The first half has four dark spots arranged in an l-shape and one in the middle of the base. The small scutellum has a black tongue and seven spots on each elytra, including three bases and a middle shoulder. 2, 2 at the back. Body backlit, belly brown or black. Egg length l 1.25mm, width 0.25mm, colostrum white to light yellow green, after dark brown. The larvae are of the oligopod type. When they are hatched, the insects are grayish yellow to greenish brown, and their heads, chests, and stomata are black. After 2 years old milky yellow. The mature larvae are 6 mm in length with abdomen fat uplift and dark yellow light. After the 3rd instar larvae, the head and thorax become thinner.
The dorsal abdomen bulges, the anus is on the back, and often has muddy excrement in vitro. Therefore, it is named 14 minuscule worms. 5-6mm long, 2.5-2.9mm wide, bright yellow, visible antennae, feet, wings, etc. Earthworm oval.
Life habits in Shandong, North China, 3-4 generations, Tianjin, 4-5 generations, Shaanxi 5 generations, with adults in the soil around the wheat or winter wheat residue in the underground. Hunchun unearthed in mid-to late March and early April, and spawned in mid-April. Egg period 3-9 days. The generation took place from mid-May to late July, and in mid-June it entered the hatching period of egg hatching. In early July, it was the larval damage period. Larvae 7-10 days, a total of 4 instar. The second generation occurred from late June to early September. In early August, it was the hatching period of eggs and the peak period of larval infestation. Three generations took place from mid-August to mid-October. High temperatures in the autumn and low rainfall occur in the fourth generation. It is observed that the average daily temperature is 20°C, the pre-flood period is 3 days, the flea period is 6-8 days, and the adult's life span is more than 50 days, which is more than one hundred days. Adults and adult larvae overlap, and adults have a pseudo-dead nature and can fly short distances. The larvae are slow to move and enter the gluttony phase at 4 years of age. After being matured, the larvae drilled into the soil at a depth of 2 cm. Adults can lay eggs 3-4 days after copulation, scattered production at the junction of leaves and leaves or young leaves.
Control methods (1) If necessary, spray 20% chlorimethanol 2000 times solution or 50% anti-influx WP 2000 times, 40.7% 1500 times, 50% phoxim EC. 1500 times the liquid, 2.5% of the cream 2500 times.
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It was approved under the FDA's priority review process on July 7, 2015. It is also approved in Europe.
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