GROWTH, DEVELOPMENT, AND SURVIVAL OF THE LARVAE OF THE RED TURNIP BEETLE,ENTOMOSCELIS AMERICANA(COLEOPTERA: CHRYSOMELIDAE), ONBRASSICA CAMPESTRISANDB.NAPUS(CRUCIFERAE)

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Abstract
Growth, development, and survival were investigated for the larvae of the red turnip beetle,Entomoscelis americanaBrown, fed excised cotyledons or first true leaves of four cultivars ofBrassica campestrisL. (Torch, Echo, Candle, and R500) or three cultivars ofB.napusL. (Midas, Target, and Tower) in the laboratory. The red turnip beetle has four larval instars and its growth curve is S-shaped. The seven cultivars ofB.campestrisandB.napustested were suitable host plants for the larvae. On all the cultivars, survival was relatively high, the weights and developmental times were similar, and the percentage of malformed adults was low. InB.campestrisandB.napus, the cotyledon stage was marginally better than the first true leaf stage as food for the larvae. Survival usually was higher and in one of the three experiments the adults at emergence were heavier on the cotyledons than on the first true leaves. However, the developmental times were similar, except in one of the three experiments where they were longer on the cotyledons, and the incidence of malformed adults was low on both stages of plant growth.

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