Because of this possibility, use a flag to mark the locations where diseased plants are removed so the adjacent plants can be checked frequently for new symptoms. For orange rust , not a problem on red raspberries, it is particularly important to inspect the planting early in the growing season. They are easy to identify in the spring. If these pustules are allowed to develop, they will produce large numbers of aeciospores which will spread the disease. If infected plants are not removed early in the spring, they become more difficult to identify later in the growing season.
Early spring is also a good time to inspect for virus diseases.
Symptom expression of many viruses is more obvious during cool growing conditions. The higher temperatures of mid-to late summer often mask virus symptoms making infected plants difficult, if not impossible, to detect. Infection Any practice that minimizes unnecessary physical damage to the plant is beneficial to the disease management program. Many plant pathogens take advantage of wounds in order to penetrate and infect the plant. Cane blight and bacterial crown gall are two important pathogens of brambles that enter the plant almost exclusively through wounds.