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Diabrotica balteata
''Diabrotica balteata'' is a species of cucumber beetle in the family Chrysomelidae known commonly as the banded cucumber beetle. It occurs in the Americas, where its distribution extends from the United States and Mexico south Central America to Colombia and Venezuela in South America.〔(Banded Cucumber Beetle, ''Diabrotica balteata'' Leconte. ) Plant Health - Pest and Diseases Image Library (PaDIL).〕 It is also present in Cuba.〔(''Diabrotica balteata''. ) Map 681. Distribution Maps of Plant Pests, 2006. CABI.〕 It is a pest of a variety of agricultural crops.〔Capinera, J. L. (Banded Cucumber Beetle, ''Diabrotica balteata''. ) Entomology and Nematology. University of Florida, IFAS. 1999, revised 2007.〕
==Description and life cycle==
This beetle is 5 to 6 millimeters long. It has a red head and black thorax. The elytra are yellow, marked with three transverse bands in shades of green or blue-green and a narrower longitudinal green line down the center. The pattern of banding is variable and nearly absent in some individuals.〔 The color of the elytra is influenced by the types of plants the beetle eats.〔Teng, H., et al. (1984). (Performance and host preference of adult banded cucumber beetles, ''Diabrotica balteata'', when offered several crops. ) ''J Agric Entomol'' 1(4) 330-38.〕 The larva is also variable and has three instars. The new larva is white and about 2.3 millimeters long. It may turn yellow as it consumes plant material. The later-instar larva may reach nearly 9 millimeters.〔
The adult mates at about six days of age. The female begins producing eggs about 16 days later. She lays a cluster of eggs every few days for two to eight weeks, producing up to 15 clusters, for a maximum of 850 eggs. A cluster has up to 100 oval yellow eggs each about half a millimeter long. The female oviposits the cluster in a crack in the soil, and the eggs hatch in 5 to 9 days. The larva develops for 11 to 17 days, pupation takes 4 to 6 days, and the adult has an average life span of 26 days. There is no diapause. In the best conditions there can be six or seven generations per year.〔
In Tamaulipas, Mexico, the beetle is most commonly observed in May through July. This may be a time of high dispersal. Abundance is apparently increased by late spring and summer rainfall, and flight activity increases with wind speed.〔Rodríguez-del-Bosque, L. A. and A. Magallanes-Estala. (1994). (Seasonal abundance of ''Diabrotica balteata'' and other diabroticina beetles (Coleoptera: Chrysomelidae) in northeastern Mexico. ) ''Environmental Entomology'' 23(6) 1409-15.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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