AbstractThe greenhouse thrips, Heliothrips haemorrhoidalis (Bouché) is one of the most common and injurious insect pest of many plants in Puerto Rico. This is specially true during dry seasons and under special ecological conditions. Three new host plants were added to the existing list and the insect is briefly described. Four systemic insecticides were tested namely: Thimet, Systox, Bayer 23129, and Bayer 19639. Using three concentration levels of each chemical perfect control of the thrips was obtained for a period of 2 months, with exception of Bayer 23129 (1-800) which permitted reinfestation at the end of 1 month.
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