Trunk Implantations of Dicrotophos for Cone-Insect Control in Slash Pine Seed Production Stands

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Abstract:

Presented are the results of 4 years of research in north Florida on dicrotophos trunk implantation to control Dioryctriaspp. coneworms and the slash pine seedworm, Laspeyresia anaranjada Miller, on 2nd-year cones of slash pine, Pinus elliottii var elliotti Engelm.

Dicrotophos technical liquid (1.08 kg active ingredient (AI) per liter) was implanted in early May into holes drilled in the tree stems. Dosage rates of 0.8–2.0 g AI per cm of tree diameter at waist height gave 86–94% control of Dioryctria spp. and 94–100% control of M L. anaranjada on mature cones harvested in mid-September of the year of treatment. Dicrotophos implanted by MaugetĀ® injectors at dosages of 0.6–1.4 g/cm diameter resulted in 30–81% control of Dioryctria spp. and 56–97% control of slash pine seedworm. Date of treatment may be advanced to early April and good control of both insects still be obtained

Foliage of trees implanted with dicrotophos in early May showed no phytotoxic symptoms at the dosages tested. Seeds from trees implanted with a 1.4 g per cm-diameter dosage of dicrotophos for 3 consecutive years showed no decrease in full-seed germination percentage when compared with seeds from untreated trees. Seed losses caused by the hemipteran seed bugs Leptoglossus corculus (Say) and Tetyra bipunctata (Herrich-Schaeffer) were also reduced with dicrotophos implants.

Document Type: Research Article

Publication date: October 15, 1971

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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