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First, the morphological characteristics adults: oval body, bright red head, compound eye dark brown, antennae linear, 11 section, black. The base of the sheath wing and the edges of the ends are black and the other parts are grayish white. Pronotum and abdomen pale yellow. The adult body is 8 mm long and 3 mm wide.
Eggs: purple-red, oval-shaped, rugby-shaped, 9-10 mm long, with a honeycomb-like pattern on the surface.
Larvae: body length 15 to 18 mm, milky white, brown head, only 3 pairs of pectoral feet, a golden needle-worm-shaped. The abdomen is 9 knots.
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Second, the biological characteristics Black Shield Shougua generation occurs once a year, with adults on the canopy or weeds on the winter. From March to March, adults began to eat, mating and spawning. Eggs were produced in topsoil at depths of 2 to 10 cm. Eggs usually lasted 6 to 8 days. In high humidity and dark conditions, hatching rates were as high as 90% or more. The larvae begin to appear in the middle and late April and last for 18-28 days. The larvae are mainly distributed in the soil layer of 5 to 20 cm above the ground, mainly feeding young ectomycorrhizal fungi, and the number is the most in May to July. The new adult can only see it in mid-May each year, and it is harmed with overwintering adults. It mainly feeds the young shoots and top teeth of longan, and the adult life can reach 19 months.
Third, the harm situation Black Shield Squash larvae hatch, the young roots to find longan feeding, the main feeding longan mycorrhizal epidermal tissue, or the smaller mycorrhizal snap. Overwintering adults in the period of March-April longan pumping spring shoots endanger the spring shoots and apical buds. In mid-May, the new adult and overwintering adults harmed the young fruit and fed the epidermis of young fruit to form squamous scars on the fruit epidermis. After June, adults continued to harm summer shoots and autumn shoots. After the young leaves of the summer and autumn were damaged, perforations or nicks were formed, and when they were severe, the leaves were all eaten. When the top bud is seriously affected, it gradually dies. In October, when the autumn shoots are mature, the adults turn to the top shoots and lateral shoots of the shoots before winter, causing the dead leaves to die. As a result, it is difficult to pump spikelets in the coming years. Cause longan significantly reduced production. Adult pests have two peak periods, in May and July respectively.
Fourth, the prevention and treatment methods Winter garden, the orchard weeds buried under pressure, in order to reduce adult wintering places. Summer loose soil, the larvae of 5 to 20 cm soil layer exposed, and then sprayed with pesticides, can effectively kill larvae.
From April onwards, each time a new shoot is taken, the number of insect pests should be observed regularly. When the number of adult shoots reaches 4 per shoot, it should be controlled by spraying. During the peak period of pests in May and July, a two-drug measure should be taken to prevent the shoots from being sprayed once at the beginning of the shoot and before the shoot is cooked. Before and after the last autumn shoot matured in October, one spray should be used to control the damage of the adult buds and lateral buds. The selected pesticides are highly efficient, low-toxic, and strongly endotoxin-absorbing. For example, 800 times of crystal trichlorfon, or 80% of dichlorvos 1000 times, and 10% of cypermethrin 2000 times, all have good control effects. When used, rotate frequently to avoid drug resistance.
The Prevention and Control of Longyan New Pest Black Shield Squash
With the growing area of ​​longan cultivation, the number of pests that harm the longan is increasing. Among them, Black Shield Squash has caused damage to Longan in southwestern Guangxi Province in recent years, and has become one of the major pests of longan in Longzhou and Daxin, and it has expanded its potential to Southeastern Guangxi. Black Shield Shougua is mainly harmful to young shoots, apical buds, and young fruit of longan. This results in a significant reduction in yield. Therefore, prevention and control should be strengthened. The insect damages and control measures are described below.