Abstract
A nuclear polyhedrosis virus originally isolated from the alfalfa looper, Autographa californica (Speyer), was evaluated against 1st and 3rd instars of the zebra caterpillar, Ceramica picta (Harris). Mortality of each instar was directly related to virus concentration and number of days until death was inversely related to virus concentration. The LD50 of 1st instars was estimated to be 63 polyhedral inclusion bodies (PIBs)/mm2 of artificial diet, while the LD50 of 3rd instars was 3300 PIBs/mm2. The LD50 of zebra caterpillar is much higher than that of most other susceptible hosts.
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