The scientific name Criocris quatuordecimpunctata (Scopolic) 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 are cypress, wheat, and asparagus.
Injury characteristics, larvae eat asparagus tender stems or epidermis, resulting in malformed bamboo shoots or food into the light stalk, resulting in bamboo shoots dwarfing or branching, mimicking clumps, severe dry and dead.
Morphological characteristics of adult long oval, adult body length of 5. 5-6.5mm, south 6.1-7.1mm, 2.5-3.2mm wide, body brown or reddish-brown, and dark spots. The front of the head, around the eyes, and antennae are all black and the rest are maroon. Head with black spots, antennae 11 short thick. The length of the prosthodontic plate is slightly larger than the width of the prosthodontic plate. Four dark spots are arranged in the first half and one in the middle of the base. The small scutellum has a black tongue. There are 7 dark spots on each elytra, including 3 bases, 2 mid-shoulders, and 2 rears. Body backlit, belly brown or black. Egg length 1 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 last-instar larvae are 6mm in length with abdomen fat uplift and dark yellow light. After the 3rd instar larvae, the head and thorax became thinner, the dorsal abdomen bulged, and the anus was on the back, and often had muddy excrement in vitro. Therefore, it was named 14 minuscule worms. 5-6mm long, 2.5-2.9mm wide, bright yellow, visible antennae, feet, wings, etc. Earthworm oval.
Living habits are 3-4 generations in Shandong and North China, 4-5 generations in Tianjin, and 5 generations in Shaanxi. Adults live in the ground around the bamboo plate or in dry stems that remain in the ground. Hunchun had unearthed activities in mid-to late March and early April, spawning in mid-April, and egg period 3-9 days. In late April and early May, it was the peak period of the first damage of larvae and larvae. One generation took place from mid-May to late July. In mid-June, the hatching of eggs began. In early July, it was the second peak of larval infestation. 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-loading period is 3 days, the flood season is 6-8 days, and the adult's life span is 50 days, which is more than one hundred days. After the adult was unearthed in spring, it firstly took the tender stems and grazing on the epidermis at the nursery, and transferred the adults to the Datian bamboo shoots in early July. From late July to early August, it entered the peak period of damage, and the adult and adult larvae overlapped. Fake dead, can fly short distances. The larvae are slow in action, and they enter the gluttony phase at the fourth instar. After being cooked, the larvae drill into the soil to cleave the larvae and shoots at the stem base of the bamboo shoots 1-2cm. Adults can lay eggs 3-4 days after copulation, scattered production at the junction of leaves and leaves or young leaves.
Control methods (1) Qing Sun Park insect removal. Before the winter or late spring, timely removal of litter from shoots, removal of dry stems, concentrated burning, eliminate overwintering adults. (2) Spray over 0.6% of unknown adult tyrants (sophora nicotinic alcohol solution) in the overwintering stage of overwintering adults, 10oo times of liquid or 20% of chlorbenzolidone 2000 times, and 50% of anti-influx of ultra-wettable powder 2000 times. , 48% of 1500 times the emulsion of Roche Ben EC, 50% phoxim EC 1500 times. (3) Mastering the spraying of the above-mentioned insecticides on the breeding seedlings at 14 o'clock in the hatching season of negative muddy eggs will facilitate the control of the insects in the younger stage of drug resistance and reduce the number of adult insects in one generation, which can achieve a multiplier effect. In early July, Daejeon placed ridges and harvested bamboo shoots. In early August, the hatching period of egg hatching and the peak period of larval infestation are the critical period for controlling this insect. The drug was stopped 9 days before harvest.
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