As these caterpillars can eat a lot of tobacco in a short period of time, once scouting has revealed populations above threshold, growers should take quick action to prevent defoliation. Threshold is one hornworm per ten plants.
Growers and scouts who are fortunate enough to see parasitized hornworms, like the one in the picture below, should keep in mind that visibly parasitized hornworms feed slowly and die before completing development. When scouting to determine if hornworms are at threshold, 5 parasitized hornworms = 1 healthy hornworm.
Written by: Aurora Toennisson
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