![]() Sprays of copper-based fungicide should help prevent future infections. Only prune during dry weather to avoid spreading the disease. Prune out dead twigs and cankers on large branches cutting 40 cm below the diseased area. Small black spots may appear on leaves, later dropping out to leave a shot hole appearance. Infected cherry fruit develop numerous small sunken black spots. ![]() It spreads readily in splashing rain from infected trees killing buds, blossoms and twigs often accompanied by gumming when it rains. Most large cherry trees in the Fraser Valley are infected with this disease. It spreads readily from early spring till June when the weather warms up on the West Coast. This is a bacterial disease of cool, wet weather areas that attacks cherries, peaches plums, apricots and related trees. Apply this treatment at 1 to 2 week intervals through the growing season periodically alternating the fungicide used. In spring and early summer apply a spray of sulfur or copper-based fungicide. Roses that flower on current season’s growth should be pruned back hard before growth starts in the spring to remove infected shoots. During the growing season, remove and dispose of infected leaves and avoid splashing leaves when watering. Severely affected leaves yellow and bloom size may be reduced. Look for circular, smudged edged black spots with fringed margins. This is a common fungal disease of roses. If you apply a one spray to fruit trees just before bloom, one more just after bloom and another two weeks later, most damage from this disease will be prevented. If you’re growing fruit or vegetables, powdery mildew can cripple flowers and sometimes cause unsightly damage to the crop. For complete protection of your plant spray with copper-based or sulfur-based fungicide Spray every 10 days from spring through to the fall. If mildew does become established, remove and destroy infected leaves. A dormant spray of lime sulfur will reduce overwintering fungus on twigs. To be effective, a fungicides spray program must start before mildew is well established. Avoid planting in shady areas or areas with poor air circulation. Particularly susceptible: roses, maples, gooseberries, phlox, nine bark, hascaps, lupines, lilacs, sage, squash and cucumbers. Warm days and cool nights are ideal for powdery mildew development. ![]() Look for white, powdery growth on leaves and shoots. Most powdery mildew are very host specific, mildew on cucumbers will not infect roses. Follow label directions on the label of all fungicides. Available disease control products are all protectants, which means they must be applied before the problem occurs. Space plants so there is good air circulation all around them to prevent disease development. The cool moist spring and fall weather in the Fraser Valley is ideal for the spread and development of plant diseases. Healthy plants are more able to resist disease. These are the diseases Art’s staff get asked about most frequently.
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