OCR Text |
Show TROUBLES OF APPLE GROWER Wooly Aphis Doe9 Much Harm ' Through Secondary Infection of Roots Means of Control. The woolly aphis, while not in itself a dangerous pest, causes much trouble trou-ble for apple growers through secondary second-ary infection of roots on which it has been working. A tree badly infested with it commonly develops diseased and decayed roots, and never bears as It should. When the aphis occurs above the ground, It should be sprayed with a 40 per cent nicotine solution, or with kerosene emulsion; and care should be taken , to get it thoroughly wet. Where it occurs on the roots of young trees, It can sometimes be controlled by soaking the ground with kerosene emulsion or stirring tobacco dust into it. Nursery stock lightly infested with the wooly aphis should have the roots dipped In kerosene emulsion. Stock badly infested, however, should be burned. Don't plant an apple orchard on new ground. Many forest trees, such as the wild crab, carry the woolly aphis, and it is safer to plant after the land has been under cultivation a season sea-son or two. |