The canes on blackberry bushes should be pruned immediately after planting if it was not done prior to purchase. Control: Some berry plants are more resistant to changes in temperature than others. Problem: Blackberry Psyllid Top 3 blackberry insect pests Bob’s number 1 pest control is a surprise, (we were anyway) that takes care of the top 3 pests Pest control is best for thrips, leaf miners and aphids (attracted to blue) Aphids and leaf rollers (attracted to yellow) Both Himalaya and cutleaf blackberry have five-angled stems whereas thimbleberry is rounded in cross section, but Himalaya blackberry is easily distinguishable from the other wild blackberries by its five distinct leaflets, each one toothed and usually oval. As the plants grow it is also necessary to look through the plants to locate and remove any leaves that have the blister-like bubbles. Is a pollinator variety present? Bacterial canker can be particularly severe on young plants in new plantings because a high proportion of the wood is succulent and susceptible to disease. Blackberry psyllids are 1/8-inch-long, aphid-like insects with three reddish stripes running lengthwise on their wings. Control: There are some types of plants that are resistant to the nematodes. Nondiscrimination Statement. Control: Crop rotation as well as the use of fungicides is recommended for controlling the disease. Mix 1 fluid ounce of malathion pesticide with 1 gallon of water in a handheld sprayer. The branches will turn completely blue on one side before they shrivel and die. Aphids; Cutworms; … Allow 3-4 new canes per plant to grow to the top of the training wire or trellis. The heat can also cause droughts which will kill the plants. It is most effective on newly hatched or small grasshoppers. This can cause the leaves to fall off early and damage the branches. root rot, © 2017 Regents of the University of California, Division of Agriculture and Natural Resources. Unfortunately, we cannot provide individual solutions to specific pest problems. Problem: Tobacco Streak Control: Certain types of raspberry plants are resistant to the fungus and should be used in areas where the disease occurs. * Pesticide use and recommendations for various areas are constantly changing. Description: Many short, thin shoots are produced and the leaves are often spotted. The insecticides should be applied to the base of the branches because the flower can become infected and bees will die. Picking the raspberries at the correct stage of ripeness is very important to keep them from becoming moldy. Control: Dispose of affected plants,