When insects attack plants in the greenhouse, parlor, or anywhere under coyer, we can generally manage to get them under control, but when they attack plants in the open air, it is according to our experience, difficult to destroy them. Insects are injurious to plants in the open air in two principal ways: some attack the branches and leaves, and others infest the roots. When insects attack the roots of a plant, we have been able to do but little to stop their ravages. We can manage somewhat better with those attacking the leaves, but even this division of the enemy is often too much for us. As a preventive, we would strongly advise that birds of all kinds should be encouraged. Since the European sparrows have favored us with their presence in such numbers, insects of nearly all kinds have much decreased. Most people will remember the disgusting "measuring worm" that festooned the shade-trees in New York, Brooklyn, and other cities ten years ago; these made their exit almost in proportion to the increase of sparrows, and now hardly one is to be seen. The same is true of the Rose slug. In my rose grounds, a few years ago, we were obliged to employ a number of boys for weeks during the summer to shake off and kill the Rose slug in order to keep the plants alive, but since we have had the sparrows in such numbers, hardly one of these pests is now seen. An examination of the crop of a sparrow killed in July, showed that it contained Rose slugs, Aphis, or green-fly, and the seeds of chickweed and other plants, proving beyond question the fact that they are promiscuous feeders. The Rose slug, (Selandria rosae), referred to above, is a light green, soft insect, varying from 1|16 of an inch to nearly an inch in length. There are apparently two species or varieties, one of which eats only the cuticle of the lower side of the leaf, the other eats it entire. The first is by far the most destructive here. In a few days after the plants are attacked they appear as if they had been burned. An excellent application for the prevention of the ravages of the Rose slug is whale-oil soap dissolved in the proportion of one lb. to eight gallons of water, this, if steadily applied daily for a week with a syringe on Rose plants, before the leaf has developed in spring, will entirely prevent the attacks of the insect. But we find that if the slug once gets fairly at work, this remedy is powerless unless used so strong as to injure the leaves.
:These appear lifeless, and adhere closely to the stems of such plants as Oleanders, Ivies, etc., and like the Mealy Bug are best destroyed by being washed or rubbed off.
The Rose-Bug, (Macrodactylus subspinosus), or Rose Chaffer, gets its name from the preference it shows for the buds and blossoms of the Rose, though it is equally destructive to the Dahlia, Aster, Balsam, and many other flowers, and especially grape blossoms. All the ordinary remedies seem to fail with the Rose-bug, and it can only be stopped by picking it off by hand.