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First, the hazard characteristics of Cheng and Ruoqiang concentrated in the tender part of sucking harm, the back of the victim leaves grayish brown or brown, with oily luster or oil immersed, curling the edges of the leaves. Tender stems, branches and fruits turn yellowish-brown and distorted. In severe cases, the top of plants is dry. Injured flowers and buds, in severe cases, can't flower and bear fruit, and the fruit is corked and loses its luster and becomes rusted wall fruit. Since the carcass is extremely small and the carcass length is about 0.2 mm, it is generally difficult for the naked eye to observe and recognize. Therefore, the start of a carcase is often easily mistaken for a physiological disease or virus disease.
Second, the occurrence of the law Camellia scutellariae occurred more than 20 generations in 1 year, egg period 2-3 days, young, if the puerperium period 4-6 days, a generation of developmental duration and temperature, summer (28-30 °C) 6- 8 days, spring and autumn (18-20°C) 8-10 days. Mainly in the female adult clams in the kale, Alternanthera philoxeroides, Bermudagrass. Ganoderma lucidum and other winter vegetables planted in the depression of the lower leaves overwintering, mainly male and female sexual reproduction, but also parthenogenetic reproduction, is the main insect source of spring vegetables the following year. Before mid-May, they sent letters from cucumbers, cowpeas and Solanaceae to breed on the main body of the wintering birds. Eggs were scattered on the back of young leaves, young fruit pits or buds. The optimum breeding temperature is 16-23°C and the relative humidity is 80%-90%. In the middle of May, the crops begin to appear dangerous on pepper plants. From late May to early August, it is a prosperous period. The rust of chillies occurs in peaks in 6- July. Into a lively, strong tenderness, when the feeding site grows old, it immediately shifts to the new tender part. When the temperature is greater than 30°C, the number of insect populations rises slowly, and when the drought is high, the field is lighter.
Third, forecasting method
1, field surveys. In mid-May, from the flowering of peppers to the fruiting period, three pepper fields were selected for continuous planting (or as Solanaceae). Diagonal sampling method was used to fix 5 points with 20 strains per point. Twenty young leaves were randomly observed in the investigation sites, and the positive and negative double-faceted eggs and eggs were carefully examined with a 10-times magnifying glass. Examinations were performed every 5 days and detailed records were made.
2, control the appropriate period. When the density of insect populations in fixed surveys rose rapidly, and the rate of pests on the surface of the survey reached 10%, showing that the damage rate of the plant reached 2%, and when the weather conditions favored its reproduction, prevention and control preparations should be made for the best prevention and control period. Apply within 7-10 days.
3. Incidence conditions. If the temperature is between 22-27 °C from late May to late July, and when the weather is fine and the air humidity is greater than 80%, there is a possibility of great occurrence; for example, if the temperature is above 35 °C, the humidity of the air is less than 80%. Weather, high mortality rates of adult and young pupa occur. In the newly reclaimed land or in the previous three years, no solanaceae or paddy field was changed to pepper.
Fourth, prevention and control measures
1, rotation. Potatoes such as peppers, cucumbers, potatoes, cowpeas, and kidney beans should be planted on the host land, preferably at intervals of 2-3 years.
2, ditch drainage. Exclude field waterlogging and reduce field humidity.
3, timely medication control. The tea plant has a short life cycle and strong fertility. Special attention should be paid to early prevention and control. The first time of application should be checked in mid-May. When the rate of insects is 10% and the rate of leaf rolling is 2%, or Spraying at the beginning of flowering. After spraying once every 10-15 days for 3 consecutive times, the hazards can be controlled. The following agents and their concentrations can be used: 1.8% chlorpheniramine 4000 times solution, or 15% fluorenone 3000 times solution, or 73% Keziite 2000 times, 20% triazole tin 2500 times, etc. have good control effect.
Oregosa, also known as the side of many food crickets, belongs to the order Acrididae, and the pupa line. This quail is miscellaneous, widely distributed, breeds quickly, and overlaps from generation to generation. It mainly harms pepper, eggplant, tomato and kidney bean, kidney bean, cucumber and other kinds of economic crops, leading to plant growth stagnation, premature plant failure, fruit deformity, and severely reducing yield and quality.