A Survey of Rootstock Usage and their Influence on Major Insects and Diseases of Citrus in Nigeria

V. Umeh, J. Kolade, A. Olaniyan, C. Amih, A. Taiga
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Abstract

In the various agro-ecological zones of Nigeria, most farmers do not use the recommended rootstocks that enable the production of vigorous and pest/disease resistant plants. Consequently there are many reports of citrus stand losses and low fruit yields in pest and disease endemic areas. This necessitated the initiation of the present study with a view to appraise the validity of existing rootstocks and evaluate, where necessary, new ones adapted to the areas lacking appropriate ones. Questionnaires were administered to 84 citrus farmers in selected producing areas of Nigeria and field visits were made to sample for pests and disease incidence in their farms. The questionnaires covered citrus types and varieties cultivated, sources of planting materials and rootstocks used, pests and diseases causing damage. Results indicated that the citrus types cultivated were in the following decreasing order of preference: sweet oranges (100 % of the farms), mandarins (32 %), tangelo (30 %), grape (28 %), lemon, lime and shaddock altogether were cultivated in 20 % of the farms. Seedlings were either obtained locally or from agricultural agents. Some farmers combine budded seedlings with seedlings from seeds to establish their orchards. Often, the rootstocks chosen for seedling production were not based on recommendations. Only 16 % of the farmers used the recommended rootstocks. Major insect pest and disease attacks that directly correlated with stand losses included those of termites, scale insects, aphids, Phytophthora and tristeza. The rootstocks used affected the severity of some pests and diseases when compared.
尼日利亚柑橘砧木利用情况及其对主要病虫害的影响
在尼日利亚的各个农业生态区,大多数农民不使用推荐的能够生产健壮和抗病虫害植物的砧木。因此,在病虫害流行地区有许多柑橘林分损失和果实产量低的报告。因此有必要开展本研究,以评价现有砧木的有效性,并在必要时评价适应缺乏适当砧木地区的新砧木。对尼日利亚选定产区的84名柑橘种植者发放了调查问卷,并对其农场的病虫害发生率进行了实地考察。调查表涉及柑橘的种类和品种、种植材料的来源和使用的砧木、造成损害的病虫害。结果表明,种植的柑橘种类依次递减,甜橙(100%)、柑桔(32%)、橘(30%)、葡萄(28%)、柠檬、酸橙和柚子共占20%。幼苗要么在当地获得,要么从农业代理商那里获得。一些农民把发芽的幼苗和种子的幼苗结合起来建立他们的果园。通常,用于苗木生产的砧木不是根据建议选择的。只有16%的农民使用了推荐的砧木。与林分损失直接相关的主要病虫害有白蚁、蚧虫、蚜虫、疫霉和线虫。采用的砧木对某些病虫害的严重程度有影响。
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