Adoption of the cocoa (Theobroma cacao) production technologies recommended to cocoa farmers by Cocoa Research Institute of Ghana (CRIG) had been low, leading to yield and production levels below potential. To investigate this issue, a formal socio-economic sample survey of 300 cocoa farmers selected randomly, by a multi-stage sampling technique, from all the cocoa growing regions of Ghana was conducted with a structured questionnaire for the individual interviews. The adoption rates of CRIG-recommended technologies such as control of capsids with insecticides, control of black pod disease with fungicides, weed control manually or with herbicides, planting hybrid cocoa varieties and fertilizer application were 10.3%, 7.5%, 3.7%, 44.0% and 33.0%, respectively. Adoption models indicated that credit, number of cocoa farms owned by the farmer, gender, age of the cocoa farm, migration, cocoa farm size, and cocoa yield affected the adoption decisions of cocoa farmers concerning the CRIG-recommended technologies analyzed in this study

Annual losses of cocoa in Ghana from mirids are significant; therefore, accurate timing of insecticide application is critical to enhance yields. However, cocoa farmers often lack information on the expected mirid population for each season to enable them to optimize pesticide use. This study assessed farmers' knowledge and perceptions of mirid control and their willingness to use forecasting systems informing them of the expected mirid peaks and the time of pesticide application. A total of 280 farmers were interviewed in the Eastern and Ashanti regions of Ghana with a structured open- and closed-ended questionnaire. Most farmers (87%) considered mirids the most important insect pest on cocoa, with 47% of them attributing 30–40% of annual crop losses to mirid damage. There was a wide variation in the timing of insecticide application as a result of farmers using different sources of information to guide the start of application. The majority of farmers (56%) did not have access to information about the type, frequency and timing of insecticide use. However, respondents who were members of farmer groups had better access to such information. Extension officers were the preferred channel for information transfer to farmers, with 72% of farmers preferring them to other available methods of communication. Almost all the respondents (99%) saw the need for a comprehensive forecasting system to help farmers manage cocoa mirids. The importance of the accurate timing of mirid control based on forecasted information to farmer groups and extension officers is discussed.

4508 ABSTRACTThe main purpose of this study was to analyze the economic efficiency of resource utilization in cocoa production of the cocoa farmers in Ghana to provide information for effective application and management of farm inputs on cocoa farms and policy recommendation. A random sample of 300 farmers in the Eastern, Ashanti, BrongAhafo, Central, Volta and Western regions of Ghana were selected, using the multistage sampling approach. Individual farmers were interviewed by using questionnaires. Descriptive and inferential analyses of the survey data were performed. Regression analysis was employed to estimate the Cobb-Douglas production function from the farm data for the measurement of technical efficiency of the cocoa farmers. The estimated elasticity from the production function and prices of input and output were subsequently used to calculate the measures of allotment efficiency of resource use by the farmers. The coefficients for household size, cocoa farm size, quantity of insecticides, quantity of fungicides, and quantity of fertilizer were 0.261, 0.514, 0.273, 0.090 and 0.325, respectively. The quantity of fertilizer applied to the cocoa farm had the highest marginal physical product (133.11 kg/ bag), and that of quantity of fungicides variable (1.39 kg/satchet) was lowest. Household size, farm size, insecticides, fungicides and fertilizer were found to have statistically significant impact on cocoa output. The sum of elasticities of the factors included in the Cobb-Douglas production function was 1.463, which was more than one, implying that the cocoa farmers were operating in the increasing returns to scale. There were incidences of inefficiencies in the management of resources in cocoa cultivation by cocoa farmers since some resources were underutilized and others over-utilized. Farmers are advised to increase the use of household members, insecticides, fungicides and fertilizer while reducing the use of forest land through increased land productivity instead of land expansion to ensure efficient use of resource in cocoa production. However, the environmental impacts of these farm activities should be assessed to ensure sustainable cocoa production.

Broad sense heritabilities were estimated in three long-term cocoa clone trials in Ghana, with 20, 18 and 15 entries. They were 0.15, 0.05 and 0.15 for yield in pods per plant, and 0.26, 0.19 and 0.40 for incidence of 'bad' pods, mostly due to black pod disease, caused by infection with Phytophthora spp. The low heritability of single plant yield, which has been known for 80 years, has been widely overlooked in cocoa research and extension, compromising the success of clone selection programmes. The heritability of the incidence of black pod disease is high enough to justify mass selection where family level data are not available. The findings will be applied in a new large-scale programme in Ghana to select clones that are high yielding in the presence of P. megakarya.

A field trial was conducted at the Cocoa Research Institute of Ghana from 1992 to 2004 to investigate the prospects of using Cacao swollen shoot virus (CSSV)-immune crops as a barrier to prevent the spread of the virus from existing outbreaks into newly established cacao plantings. The treatments consisted of four crops—citrus (Citrus spp.), oil palm (Elaeis guineensis Jacq.), kola (Cola nitida Vent.), and cacao (Theobroma cacao L.)—planted as a barrier between cacao trees serving as test plants on one side and as source of CSSV strain 1A infection on the other. Over a 7-year period post CSSV 1A inoculation, the citrus and oil palm barriers were the most effective in protecting test cacao trees from cacao swollen shoot virus disease (CSSVD) spread. The two crops gave comparable results (P = 0.9766) in terms of the cumulative number of visibly infected trees (1 and 5 of 522, respectively). The kola barrier, on the other hand, had a significantly (P < 0.000l) higher number of symptomatic trees (89 of 522) than citrus and oil palm. All three crops (citrus, oil palm, and kola) provided better protection than the control (cacao), which had 134 visibly infected trees out of 522. As shown by economic analyses, growing citrus, oil palm, or kola as barrier crops was as profitable as growing cacao. The implications of the results on the management of CSSVD in Ghana are discussed.

The sheanut tree (Vitellaria paradoxa Gaertn) is indigenous to the Guinea Savanna belt of West Africa extending from Senegal in the West to Sudan in the East. The tree's response to vegetative propagation methods is very poor and inconsistent. Impact of different fungicides (Ridomil 72 plus, Dithane M45, Nordox 75 and Kocide 101), their different concentrations and frequencies of application and the application of a hormonal rooting powder (Seradix 3) were studied at Bole, Ghana from June to August, 2005. Significant rooting was observed when Dithane M45 was applied at 2000ppm three times (once every two weeks) during the rooting period and gave the highest rooting performance when combined with Seradix 3 hormone. High concentrations of Dithane M45 did not significantly affect the degree of infection on cuttings. However, cuttings which were not sprayed with any fungicide recorded significantly (P< 0.05) high fungal infection. Ridomil 72 Plus, Kocide 101and Nordox 75 lower rooting performance in shea cuttings.

Data from three cocoa (Theobroma cacao) clonal selection trials are used to investigate the genetic and environmental components of variation in yield and the percentage of total pods affected by black pod disease (Phytophtora pod rot). Simulations based on these estimated components of variation are then used to discuss the best choice in future of numbers of clones, replicates and years of harvest to maximise selection advances in the traits measured. The three main conclusions are the need to increase the number of clones at the expense of the number of replicates of each clone, the diminishing returns from additional years of harvesting and the importance of widening the genetic base of the clones chosen to be tested.

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