Abstract
Laboratory studies were conducted to evaluate harlequin bug, Murgantia histrionica (Hahn), development on broccoli, mustard, and rape, and feeding damage on broccoli. Duration of the first stadium was 4.9±0.6 days. Development times of the second through fifth instars reared on broccoli, mustard, and rape were not significantly different. However, preoviposition periods were shorter for nymphs reared on rape, 19.5±0.9 days, compared with mustard, 24.6±1.0 days. The average number of eggs per female (149) reared on broccoli had a hatch rate of 71%. Harlequin bug feeding damage was evaluated on broccoli with 5, 6, and 7 pairs of leaves. Densities of 3, 6, 9, and 12 bugs per plant were placed on broccoli with 6 or 7 pairs of leaves. Plants with 5 pairs of leaves were subjected to densities of 2, 4, 6, and 8 bugs per plant. Feeding damage resulted in death of all plant ages tested. The younger plants succumbed to feeding injury sooner than the older plants, and time to death of plants decreased as insect density increased. This trend was more apparent for broccoli plants with 7 pairs of leaves (20 cm tall), than the younger plants.
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