. Bulletin. Agriculture -- Ontario. pennsylvanica : All three species of Blister beetles are injurious in the adult stage. They are about half an inch long, with long- legs, and soft, flexible wing covers. The Old-Fashioned form is striped yellow and black. The Black and Gray forms look much alike, except for color. In the larval stage these insects are beneficial, living upon the eggs of locusts. /. Blistering Beetles. Remedies : Spray with arsenical poisons. On account of their bene- ficial nature, it is not advisable to spray unless they are very abundant. Beet-Leaf Miner (Pegomya vicina) :
. Bulletin. Agriculture -- Ontario. pennsylvanica : All three species of Blister beetles are injurious in the adult stage. They are about half an inch long, with long- legs, and soft, flexible wing covers. The Old-Fashioned form is striped yellow and black. The Black and Gray forms look much alike, except for color. In the larval stage these insects are beneficial, living upon the eggs of locusts. /. Blistering Beetles. Remedies : Spray with arsenical poisons. On account of their bene- ficial nature, it is not advisable to spray unless they are very abundant. Beet-Leaf Miner (Pegomya vicina) : The larvae mine inside the leaf. At first the mines are small, but later, large blotches appear on the upper side of the leaf. The green tissue of the leaf is devoured, and the function of the leaf is destroyed. Remedies : Gathering and destroying infected leaves; crushing the maggot inside the leaf. Woolly-Bear (Spilosoma virginica) : Large caterpillars, about one and one-fourth inches in length. The color varies from pale yellow to. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ontario. Dept. of Agriculture. Toronto : The Dept.
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