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The Control of the Pine Processionary Caterpillar Thaumetopoea wilkinsoni Tams by Systemics, with Special Reference to Stem Injection of Phosphamidon
Zeitschrift für Pflanzenkrankheiten (Pflanzenpathologie) und Pflanzenschutz
Vol. 75, No. 10 (Oktober 1968), pp. 591-604
Published by: Verlag Eugen Ulmer KG
Stable URL: http://www.jstor.org/stable/43233427
Page Count: 14
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In trials carried out on the systemic control of the pine processionary caterpillar Thaumetopoea wilkinsoni Tams, three insecticides have shown systemic action when bioassayed on pine trees, viz. Dimecron (Phosphamidon 50), Rogor (Dimethoate 38) and Diptagen (Trichlorfon 60). Dimecron injected into the tree stem successfully controlled Thaumetopoea larvae. The dosage required for trees was 60 ppm of the stem volume for small trees (breast height diameter 20 cm) and 100 ppm for large trees (B. H. D. 42 cm). The deposition of the chemical in toxic amounts throughout the crown took about 8-13 days and its persistence lasted several weeks, depending mainly on the dosage per tree and the application period. The treatment proved satisfactory for all pine species planted in Israel. No undesirable side effects were noted. The treatment is carried out by boring in the trunk base equally spaced holes to a depth of about two-fifths of B. H. D., one hole for each 18 cm of girth at B. H. The holes should be immediately filled with Dimecron. The proper time for the application is from mid-December until mid-January.
Zeitschrift für Pflanzenkrankheiten (Pflanzenpathologie) und Pflanzenschutz © 1968 Verlag Eugen Ulmer KG