Comparison of Immature Sorghum Midge (Diptera: Cecidomyiidae) Development on Resistant and Susceptible Sorghums

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Abstract
Development of immature sorghum midges, Contarinia sorghicola (Coquillett), in spikelets of a resistant and susceptible sorghum, Sorghum bicolor (L.) Moench, hybrid was compared by periodically collecting spikelets from midge-infested panicles, and by dissecting the spikelets under a stereomicroscope. Proportionally, a greater number of midges reached the late immature instars (large larvae and pupae) in spikelets of the susceptible hybrid compared with the resistant hybrid. In addition, a higher proportion of large larvae and pupae were positioned next to the caryopsis in spikelets of the susceptible hybrid compared with the resistant hybrid. Tolerance was not an important resistance mechanism.

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