The scientific name is Cassida nebu10sa Linnaeus, Coleoptera. Distribution from the north of Heilongjiang, Inner Mongolia, Xinjiang, South slightly over the Yangtze River.
Host beets, pods, oysters, etc.
Injury characteristics Adults bite leaves into holes, and larvae scrape leaves and affect the development of sugar beet.
Morphological characteristics Adult body length 7-8mm, flat, oval, brown, irregular dark spots, pronotum, elytra wide, shield-like, head hidden under the thoracodorsal plate, sheath wings arranged Into the longitudinal rough points and ditch 9 lines. Eggs are oval in shape and are massive. Each egg has 10 to 15 capsules with mucus that condenses into a translucent membrane. The last-instar larvae have a body length of about 8 mm, yellow-green, and the head is wide and thin, with 17 pairs of small thorns on each side, and the longest one on the back side. The length is 6.5mm. yellow-green. Living habits are born in the Northeast for 2 generations, and the adults spend winters under weeds or plant debris. At the end of May of the following year, in the first half of June, the eggs were spawned soon afterwards. The egg accumulation was massive. The eggs were prolific on Cai and produced 1-2 pieces per day. Each piece had 10 to 15 eggs. A maximum of 200 eggs can be laid in each female's life.
The egg period of 5-7 days, the temperature can be extended to 10-15 days. After hatching, the larvae feed on the leaves of the grey vegetables. When the feed is lacking, they climb to the beets and feed on them. A total of 15 to 25 days of larval period, a total of five instars, mature larvae exposed on the leaf surface. The flood season 5-12 days. The first generation of adults emerged in early July and were affected by feeding. Spawning began after half a month. After the emergence of the second generation of adults, the damage is not serious and wintering is no longer required.
Control methods (1) Timely eradication of weeds in the field will have a certain effect on the prevention of sugar beet shells. (2) After the sugar beet is harvested, the adult's overwintering concealed objects, such as the stems and leaves and the mother roots of the seed collection plants, can be promptly removed, which can reduce the damage of the leap year. (3) If necessary, spray 2.5% trichlorfon powder, 1.5-2kg per 667m2 or 80% dichlorvos EC 1000g.
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