Nweke, F.I. 1994 Farm level practices relevant to cassava plant protection.. African Crop Science Journal 2(4): 407-417.

Notes: [Integrating the management of pests, weeds and diseases of cassava in Africa, Thresh, J.M., Otim-Nape, G.W., Fabres, G., Yaninek, Y.S. & Adipala, E. (Eds.), a conference held in Kampala, Uganda, 26 June-1 July 1994.] Information was collected during the Collaborative Study of Cassava in 10 African countries which considered the incidence of cassava mealybug (CMB) [Phenacoccus manihoti], green mite (CGM) [Mononychellus progresivus], African cassava mosaic virus (ACMD) [cassava African mosaic bigeminivirus] and bacterial blight (CBB) [Xanthomonas axonopodis pv. manihotis] of cassava in relation to farm practices. ACMD was the most widespread of the 4 problems assessed and was observed in almost all the representative villages in West Africa. Cassava mealybug was the least widespread, although the incidence was relatively high in Nigeria, Malawi and Tanzania. Cassava green mite was most widespread in the countries of eastern and southern Africa, whereas CBB was widespread in Nigeria and Uganda. The problems of CGM, ACMD and CBB were not higher in any other climate zone, than in the humid climate zone, while those problems were not less severe in any other climate zone than in the subhumid climate. While the incidences of the various pests and diseases varied between villages which used and others which did not use purchased inputs, symptom severity scores of most of the problems were lower in villages where the purchased inputs were used. In Nigeria, where improved varieties were mostly used, the symptom severity scores of all 4 pest/disease problems were lower for the improved varieties that had been released in the 1970s than for the local land races. Similarly, based on information from the 10 countries, the symptom severity scores of the 4 problems were lower among villages which had easy access to a market than in other villages. The symptom severity scores of the 4 problems were lower when cassava was grown in rotation with other crops than in other situations. The problems were also lower under continuous cultivation systems although the reason is not clear. There was a high rate of turnover in the land races grown and susceptibility to pests and diseases was one of the most frequently mentioned reasons for this.