Plant a Home Raspberry Patch (cont)
By: Susan Littlefield
Raspberries are generally pretty problem-free. But there are a couple of insects that you may need to deal with, chief among them Japanese beetles. These omnivorous pests enjoy a good raspberry leaf, so you may need to control them with handpicking or sprays of neem oil. If you notice the tips of your canes drooping over, the raspberry cane borer is probably at work. Look for rows of punctures about 6 inches from the tip of the cane. This is where the female beetle has laid her eggs. When these hatch, the developing larvae tunnel down through the shoot, causing it to wither. To control this pest, simply cut off and destroy the shoots below where the larvae are active.
If you see a whitish-gray powder on the leaves, it is probably a fungal disease called powdery mildew. This is often more of a problem in a crowded patch with poor air circulation, so be sure to thin out your primocanes each spring.