It is often difficult to recognize the adverse effects of environmental stress. That is why the environmental stress on the raspberries and blackberries is not well defined. These sources of stress can be: wilt caused by drought, tissue death due to frost, damage to shoot and leaf caused by high temperature, nutrient element below level that can provide normal development. All of this creates serious pressure on raspberries and blackberries. It is difficult to make a diagnosis if the negative effects of environmental stress are similar to those of various diseases and pests. Each stress factor has a reciprocal interaction between the plant’s own physiological conditions and other environmental factors. For example, If the unripe raspberry shoots that have just begun to develop in the spring season meet the temperature of -7 o C, the shoot will most likely die. But the same shoot will encounter no problems in the autumn season when compared to the same temperature conditions. The presence of certain conditions, such as moist soil, food shortages, diseases and insect injuries, make exiles more sensitive to low temperature damage. This sensitivity also occurs when shoots are found to be fully dormant (in complete resting state).
Environmental stress sources, such as cold springs, which originate from low temperatures, have an important effect when the plant is ready for some disease infections. However, the prevention of such damages, Raspberries and blackberries are not considered enough by farmers. It is important to know the sources of stress for profitable and sustainable raspberry and blackberry cultivation and to estimate the harm they will cause on the plant. In particular, the possible effects of some sources of stress in combating diseases and harms should be known.