The three-spotted bee is a newly discovered pest on the rose in recent years, causing the dry stem to dry and break, which causes the flower yield to drop, which can cause a severe production. Pesticide control should be carried out in time to avoid economic losses.
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The three-spotted bee of Rose has five generations in Pingyin County, Shandong Province, and the generations overlap. The old larvae are used for wintering in the soil around the roots of roses or roses. The wintering generation has been phlegm since early April, and it has emerged as an adult and spawned in the middle. The wintering period of the wintering period is from late April to early May, the first generation is in the middle and the middle of June, the second generation is in the middle of July, the third generation is in the middle and late August, and the fourth generation is in the middle and late September. After the fifth generation of larvae matured, they did wintering.
When the temperature reached 15.5 °C in mid-April, the cockroaches began to emerge, and most of them were feathered during the day. The male feathering period was 2 to 3 days earlier than the female. After the larvae of the wintering larvae emerged, the adults bite through the clam shells and climb to the ground. They calm down between the soil particles or between the leaves. After 4 to 5 hours, they flutter and test, and then fly to the tail. Female bees continue to fly and crawl between the rose plants before spawning. They choose to be in the shade of the plant's young shoots. A few choose to be on the petiole, and cut the cortex of the stem with an abdomen saw-like ovipositor, about 1 mm deep, and lay eggs. In the stem tissue, the egg trough is 12 to 28 mm long, and the eggs are arranged in an "eight" shape in the trough. The parthenogenetic phenomenon is widespread in the worm, and all of its offspring develop into males. Adults are active during the day and remain at the opposite side or front of the leaves at night, without feeding. It is most active from 10 to 15 hours during the day, and activities are significantly reduced on cloudy or windy days. Adults are suspended. Female adults have an average lifespan of 4-6 days, and male adults have an average lifespan of 4.1 days. The larvae of the first to second instars have a habit of clustering, and the common clusters gather at the edge of the leaves. After three years of age, the food is dispersed and eaten, and the food intake is significantly increased. The old-aged larvae are overwintered in the litter around the roots of the damaged plants or in the 3 cm soil layer on the surface, and sometimes dozens of them are tied together in blocks and clusters.
Let's take a look at the prevention steps along with the pesticide network :
The adult stage was sprayed with 40% phoxim emulsifiable concentrate 5000 times.
The larvae of the first to second instar larvae are the best control period. It can be controlled with 40% phoxim emulsifiable concentrate 8000 times.
Tips from the China Pesticide Network , it is necessary to remove the insect source and cut off the spawning branches and destroy them collectively. Remove litter and destroy it in time during the winter or growing season. The root of the rose is 5 to 10 cm, so that the cockroach cannot be feathered or the adult after emergence can not be unearthed and died.
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