Tamarisk Leaf Beetle Life Cycle (Diorhabda Carinulata)

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Tamarisk Leaf Beetle Life Cycle (Diorhabda carinulata) Below is an outline of the various stages in the Tamarisk Leaf Beetle’s life cycle. STAGE 1: Eggs of the Tamarisk Leaf Beetle Female lays 10-20 eggs per day Production ranges from 300-500 eggs per female Eggs hatch in 7 days STAGE 2: 1st and 2nd Instar Larval Stages 1st instar larvae (lower) lasts 4-7 days, 1-2mm in length 2nd instar larvae (upper) lasts 4-6 days, ~4mm in length STAGE 3: 3rd Instar Larval Stage Feeds for 3-7 days Then drops or crawls from tree into leaf litter Enters inactive pre-pupal stage (3-7 days) 5-9mm in length STAGE 4: Pupal Stage 3rd instar forms a pupal case Made of loose silk cells and plant debris Pupal stage lasts 7-10 days STAGE 5: Adult Leaf Beetle Active Stage Newly emerged adults feed and mate immediately and are 5-6 mm long and 2.5mm wide Active adults move to nearby tamarisk trees to leave food for offspring All life stages eat ONLY tamarisk leaves Adults secrete pheromones to promote aggregation and mating Female lays eggs on tamarisk foliage every day after mature Adults live 2-4 weeks after emerging in either late spring or early fall (2 life cycles per year) STAGE 6: Adult Leaf Beetle in Diapause Stage In late fall adults become less active and gorge on tamarisk leaves Develop ‘antifreeze’ body fluid Drop to the ground and burrow deep into the leaf litter Overwinter in diapause phase (insect version of hibernation in mammals) Life Cycle Sources: Bean, D. 2006. Personal Correspondence. Manager of Palisade Insectary & D. elongata extraordinaire! Lewis, P.A., C.J. DeLoach, A.E. Knutson, J.L. Tracy and T.O. Robbins. 2003. Biology of Diorhabda elongata deserticola (Coleoptera:Chrysomelidae), an Asian leaf beetle for biological control of saltcedars (Tamarix spp.) in the United States. Biological Control 27:101-116. Hansen, R. Saltcedar leaf beetle, Diorhabda elongata ssp. Deserticola (Coleoptera:Chrysomelidae) Biology and Identification [Brochure]. (2005). Fort Collins, CO: USDA-APHIS-PPQ-CPHST. Photo Credits: James Tracy – USDA-ARS, Temple Texas, Bob Richard - USDA-APHIS-PPQ, Dan Bean - CDA Palisade Insectary, and Tim Carlson – Tamarisk Coalition. .

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