FIG. 254. THE BEAN FLY. a, Female, magnified; b, Male, natural size, and magnified.
Paris Green (Arseniate of Copper). Owing to its poisonous nature, this should not be used where there is fruit on the trees or vegetables under them; but there is no better destroyer of hard-dying insects. Its application is very simple. Mix 1lb. of the green with 30gals. of water, and well wet the infested parts of the trees, using a fine-rosed watercan or garden engine for the purpose. The operator's hands should be free from sores and scratches, or dangerous ulcerations may ensue.
Gas Liquor. If this can be obtained from a gas-house, it should be diluted with twice its bulk of water, and applied in the same manner as Paris Green, being washed off with clean water in a few hours. If the process be repeated on two or three consecutive nights, it will be found certain in its effects; moreover, it is not very poisonous. The finger or thumb, or the Aphis brush, applied early, will often exterminate these obnoxious insects at once. The first of the methods above described is perhaps the most accessible and the safest to use. Poisonous insecticides are more or less dangerous, especially in the hands of the inexperienced. Black Fly is, however, one of the most difficult insects to eradicate, especially if allowed to multiply. A syringing of clean water should follow either of the above applications. See also [Aphides.]
BLACK JACK OAK. See Quercus nigra.
BLACK MAIDENHAIR SPLEENWORT. See [Asplenium Adiantum-nigrum.]
BLACK PINE. See Pinus austriaca.
BLACKTHORN. See Prunus spinosa.
BLACK VARNISH TREE. See Melanorrhœa.
BLACK WATTLE. See [Callicoma serratifolia.]