Turnip Mosaic Virus (TuMV) infects most cruciferous plants, but is most damaging in Chinese cabbage, turnip, mustard, and radish. The most common symptom in these crops is a distinct mosaic of light and dark green colors in the leaves. Depending upon the virus strain and the crop species, necrotic streaks, flecks, or ringspots may also occur. Necrotic spots and ringspots are the primary symptom in common cabbage, but the severity of symptoms is cultivar dependent.
The guide contains the latest recommendations for insecticides, fungicides, nematicides, and herbicides for commercial apple production. The guide is a collaborative effort by Extension specialists and researchers from land grant institutions in the southeastern United States.
Symptoms occur in cabbage and Brussels sprouts. As the heads approach maturity, inner leaves become necrotic along their margin. Margins of one or more leaves turn brown beginning at the leaf pores. The area affected may be a narrow band or involve up to half of the leaf. Symptoms occur at one time and are not progressive. There is no external evidence that the heads are affected by tipburn.
Mango trees (Mangifera indica L.) are cultivated in many countries of East, South and West Africa. In these countries, mangoes contribute to farmer family diets as well as serving as a cash crop. Mangoes are a delicate fruit and, therefore, sensitive to transport, which limits trade opportunities. However, there is considerable market interest in processed mango—in pulp or dried form.
Common challenges to mango production in Africa
Organic farmers rely primarily on preventive, cultural, and integrated methods of pest and disease management. Additionally, there are a number of materials that can complement and support organic management. This guide was developed to provide a useful and scientifically accurate reference for organic farmers and agricultural professionals who are searching for information on best practices, available materials, and perhaps most importantly, the efficacy of materials that are allowed for use in organic systems.
Evaluación experimental del clorotalonil en el control de la sigatoka negra (Mycosphaerella fijiensis) en plantaciones de plátano (Musa spp. AAB)
Revised annually, this guide provides spraying schedules for insect and disease pests of apple, pear, cherry, peach and plum trees. You will find safety tips, hints for figuring chemical application rates, and discussions about most pests that attack Missouri fruit trees.
The guide's reference format facilitates locating specific fruit and disease information quickly. Each entry includes chemical material, rate per 100 gallon, rate per acre and comments for each pest/problem.
Xanthomonas campestris pv. Armoraciae
Xanthomonas leaf spot occurs on all cultivated crucifers and several wild crucifers. The major symptom is leaf spotting, but lesions can also occur on cotyledons, flower stalks, and fruit. Small leaf spots occur scattered over the leaf surface as a result of invasion of bacterium through pores.