Scientific name Mamestra brassicae Linnaeus Synonyms Barathra brassicae L. Lepidoptera, Noctuidae. Alias ​​cabbage robbery. Distribution of sugar beet growing areas such as Northeast China, Inner Mongolia, Ningxia, Sichuan and Xinjiang.
Hosts are cruciferous plants such as beets, cabbage, canola and cabbage. It has been reported recently that the worm infested mulberry trees in Sichuan.
The characteristics of larvae eat sugar beets leaves, leaving only the veins, eat the leaves often eaten large, continue to eat petrified petiole and roots, often resulting in root-cut reduction of 10 to 20%, sugar content decreased by 0.8-1 degrees.
Morphological characteristics Adult body length 20mm, wingspan 45mm, brown. The forewings have a pronounced kidney-shaped spot (white inside the spot) and a ring-shaped spot with a small dark spot on the outer edge of the hind wings. Eggs are hemispherical, light yellow, with a brown papillae on the top, and longitudinal ridges and horizontal lines on the surface. The mature larvae have a body length of 50mm and a brown head. The belly of the clothing department is light green and the back is yellow-green or tan. Each brown section has a back eight-character pattern on the back. The length is 20mm, brown, and thorns are 2 long thorns and the ends are swollen.
Living habits Ningxia, Inner Mongolia, Heilongjiang occurred in 2 generations, 2-3 generations in North China, 1-3 generations in Xinjiang, Shaanxi Huihui and Sichuan Chongqing in 4 generations, and the wintering in the soil. In North China, the occurrence period of the three generations of adults was in late May, mid-July and late August. The first-generation larvae attacked late-maturing cabbage, beets, and spinach in early July in early July; the second-generation larvae were on fire in summer and were very light; the third-generation larvae ravaged autumn cabbage in late August and early October. Autumn cabbage, very serious. Adults have a strong tendency towards black light and molasses odors. They like to grow eggs in the tall, dense fields of the plants. Eggs are produced on the back of the host's lobe. Monolayers form blocks. Each woman can produce 4-5 pieces, about 600-800. grain. The development of the egg is moderately warm at 23.5-26.5°C for a period of 4 to 5 days. A total of 6 instar larvae, 1-2 instar larvae because the first 2 pairs of gastropods have not yet grown, so walking, such as ulnar warts, easy to be confused with Spodoptera exigua larvae; 3rd instar although scattered, but generally still around the spawning plants On the plants, therefore, they showed a clustered distribution in the field; after 4th instar, the amount of food increased significantly; 5-6 years were gluttonous. The development of larvae is suitable for a temperature of 20 to 24.5°C, and the mature larvae enter the soil 6-7cm to build up the earthworms. The development of earthworms is suitable for a temperature of 20 to 24°C, and the development period is about 10 days. However, the duration of the summer breaks is up to 2 months, and the duration of the overwintering season is more than half a year. The suitable moisture content of earthworms in the soil is preferably 20% moisture content. Soil moisture content below 5% or more than 35% will greatly reduce the emergence rate. During the period of adult occurrence, the rainfall is 30-60mm, and the balance is favorable. If it is less than 20mm or 80mm, it is not conducive to the occurrence of adults. Adults need nutritional supplements. Therefore, the presence or absence of honey plants in adulthood has a very significant impact on adult longevity and fecundity, which is directly related to the amount of the next generation. The optimal temperature for the development of Brassica julibrissin was 18-25 °C, relative humidity 70-80%, temperature lower than 15 °C or higher than 30 °C and relative humidity lower than 68% or higher than 85% were not favorable to Brassica rapa happened. The natural enemies are Trichogramma spectabilis, Trichogramma dendrolimi, Trichogramnos olivaceus, Pseudoxylum cuniculus, Spodoptera littoralis, Crested beetles, and pathogenic microorganisms such as Pyralidae and Brachyceras karst polyhedra Viral and so on.
Prevention methods (1) Investigate the density of overwintering pupae every year from October to mid-April to mid-April, and when each m2 reaches 0.5 pounds of overwintering pupae, about 20 days after the emergence of adults, larvae may grow on crops such as sugar beets and cabbages. occur. Overwintering pupa density is lower than this indicator, and when the adult moth is in the peak period, when the moth trap size is less than 200 per moth trap, it may occur moderately and a forecast is issued accordingly. In the middle and late July, the rainfall is 20-30mm, and the maximum is not more than 70mm. The number of adult moths trapped per moth trap is higher than 250 in the adulthood, and second generation larvae may occur. At this time, it is necessary to go deep into the field to investigate the hatching of eggs. When the eggs are hatched with more than 80-90% of the eggs, larvae can occur. If the eggs do not hatch or are parasitized by Trichogramma, light occurs. (2) When more than 90% of the eggs have hatched, the larvae are mostly in the stage of 2-3 years, immediately spraying 2.5% deltamethrin EC per 667m2 10-20% or 20% Fenvalerate EC 10-20ml, 50 % Phoxim EC 35-50ml, 25% ECS 40-50ml, 90% crystal trichlorfon 40g, 2.5% Trichlorfon powder 1.5-2kg.
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