The rose three-leaf bee is the main leaf pest of Chinese rose, rose, rose and yellow thorn. In recent years, the damage caused by rose beetle rose more and more serious, affecting the integrity of the capital’s green landscape and ecological security, and it must be strengthened.
Feature recognition
Adults: about 8 mm in length, head, tentacles, chest and feet black, with an inconspicuous metallic luster. The abdomen is orange and the abdomen back part is black. Wing black, translucent.
Larvae: When hatched, the body is milky white, the head is light yellow, the body color becomes green after the second instar, the head shell is black, the body color changes from green to yellow after 4th instar, the mature larvae are green on the back of the chest, the back of the abdomen is orange, and The belly yellow gradually deepens. The larvae had 3 pairs of thoracodorsus and 7 pairs of gastropods. The sixth and seventh pairs were underdeveloped and degenerate into tumor-like. The mature larvae are 13.1-16.8 mm long.
Damage characteristics
1. The female adults lay their eggs at the shady areas of the young shoots of the year, and the eggs are arranged in an “eight†shape. With the growth and development of the Chinese rose, the laying eggs are increasingly cracked, and finally a shuttle-shaped crack can not be recovered, resulting in rose branches. Easy to break off; larvae feeding on the leaves and petioles; young instar larvae have the habit of clustering edge damage, after the 3rd age scattered feeding, eat the leaves in severe cases, leaving only the petiole and the main vein.
2. Two generations a year and overlapping in generations; adult larvae overwinter in the soil around rose or rose roots.
3. The adult has a feign death; the adult is active from 10 o'clock to 15 o'clock and leaves it at rest in the leaves at night.
Control methods
In the adult stage, spraying with 1.2% nicotine, such as matrine, was used for prevention and control.
Younger larvae use 3% hyperosmolar phenoxyl, 48% of LS, spray control.
Timely cut off the twigs and remove litter.
Protect and use natural enemies such as the bee-beetle, Chinese giant salamander, and spider.
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