OCR Text |
Show Mosaic Disease Causes Trouble With Raspberry Raspberry growers have within the last few years become acquainted with a serious disease known as mosaic This is one of the so-called virus diseases dis-eases which is carried in the sap of the p(ant and is spread from plant to plant by means of san-suckinr insects, in-sects, the principal olTendor being a large green aphid or plant louse. This disease has become so serious in most of the raspberry growing states that drastic efforts are being taken bv nursery inspection forces to hold it under control. It reduces the vigor of the plant, and consequently the yield. The fruit Is smaller and 'more crumbly on mosaic plants than on healthy plants. So sweeping in Its effect has been the mosaic disease that In some states entire varieties have been discarded because of the prevalence of infection. Nurservmen and fruit growers cannot be urged too much to make every effort to secure se-cure and maintain disease-free plantations. planta-tions. If mosaic-free plants can be secured and planted In beds Isolated by at least 20 rods from anv other . raspberry field, they can generally be kept free from the disease It "will require watchfulness and immediate i gg ng nnd destruction of infected plants whenever they nppear. |