ABSTRACT
The depressing effects of nematodes in citrus, especially for Thylenchulus semipenetrans, are often masked and cannot be readily identified. In fact, the plants which are genetically vigorous or well-fed in favourable environmental conditions may give economically satisfactory production which is in reality less than that which could be possible. Present-day research tends to show that suitable management of plants infested by nematodes may help to improve the development and the productivity of citrus plants. The aim of this type of programming in controlling nematodes must mainly tend to the avoidance of all types of stress on the citrus fruit plants. Maugeri has illustrated the flowering and vegetative characteristics of weeds, their biology, and the influence of infesting weeds on the productivity of citrus fruits. The choices, therefore, depend on the chemical and physical characteristics of the terrain, the annual rainfall, the possibilities for irrigation, the lie of the land, the type of flora and on many other local factors.
