Insects and insecticidesA practical manual concerning noxious insects and the methods of preventing their injuries . THE BRANCHES. 147 through a sharp-pointed beak which is inserted intothe bark of the succulent twigs, and also into theleaves. It has comparatively few natural —These bugs may easily be destroyedwhen gathered in clusters on trees or walls by pour-ing boiling water, gasoline or kerosene upon them. INJURING THE BRANCHES. The Spotted Willow-twig Aphis. Melanoxanthus various species of willow are particularly sub-ject to the attacks of aphides or plant l
Insects and insecticidesA practical manual concerning noxious insects and the methods of preventing their injuries . THE BRANCHES. 147 through a sharp-pointed beak which is inserted intothe bark of the succulent twigs, and also into theleaves. It has comparatively few natural —These bugs may easily be destroyedwhen gathered in clusters on trees or walls by pour-ing boiling water, gasoline or kerosene upon them. INJURING THE BRANCHES. The Spotted Willow-twig Aphis. Melanoxanthus various species of willow are particularly sub-ject to the attacks of aphides or plant lice. No less than nine of these insectshave been described aspreying upon them. Nopart of the tree, except,possibly, the root, is ex-empt from attack, and thebark and twigs receive theexclusive attention of atleast five species. Some ofthese often become seri-ously injurious, and morefrequently, perhaps, theirpresence is extremely an-noying where they occurupon shade or ornamental trees in private groundsor public parks. The aphides most commonly found upon willowtwigs belong to the genus Melanoxanthus. Three. Fig. 74. Spotted Aphis: oviparousfemale. Magnified. 148 INSECTS AFFECTING SHADE TREES. American species of the genus are known. TheWillow-grove Aphis (M. salicti) is probably the com-monest in the eastern and middle states. It is verysimilar in appearance and habits to the nearly re-lated Spotted Willow-twig Aphis, represented at to 76. This insect lives over in the egg state onthe bark of willow twigs. Early in spring the eggshatch into young plant-lice which insert their tinybeaks into the tender bark and suck out the grow rapidly, and each one soon becomes the
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