Abstract
The European pine shoot moth ( Rhyacionia buoliana ) was controlled by spraying infested trees during June with “Penetrol” diluted 1 to 200 plus “Black Leaf 40” 1 to 500. Three sprays were applied at intervals of a week or ten days. These sprays killed the adults hiding in the trees and the eggs laid upon the terminal twigs. The juniper web worm ( Dichomeris marginellus ) and the pine needle miner( Epizeuris aemula ) were also effectively controlled by means of several summer contact sprays applied in Mayor early June against the larval stages before the adults had an opportunity to emerge and lay eggs on other plants. The black vine weevil ( Brachyhincus sulcatus ), the grubs of which were feeding on the roots of taxus plants, were successfully controlled in the adult stage by means of a poison apple bait. Tests against a thrips infesting privet showed that dust insecticides were more effective than liquid sprays and that the best materials were dusts containing nicotine tannate or ground pyrethrum flowers. Tests against the elm mite ( Eriophyes ulmi ) showed that sprays or dusts containing sulfur were much more effective than sprays containing pyrethrum extract as the active principle.
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