ABSTRACT Insecticide bio as 3 ays were carried out on JD. thoracica (a) adults by topical application of 1 pi drop of toxicant on their nota; and Ob) eggs by dipping them into insecticidal solutions for 30 min. LC50 values obtained from the tests on the adults were: Gamma BHC, 26.4Ctog/l; Pirimiphos methyl (PP511) 28.00 mg/l; Serin, 67.00 mg/l and Malathion, 580.00 mg/l. Values obtained from the eggs tests were: PP511, 1.30 mg/l; Sevin, 5.30 mg/l; gamma BHC, 18.30 mg/l andMalathion, 83.00 mg/...
ABSTRACT Ten clones and 10 hybrids each of four cocoa populations; Nanays (Na), IMCs, Trinidad introduction (Ts) and Parinaris (Pa), were screened for attractiveness and resistance/tolerance to the capsid, Sahlbergella singularis (Hagl.). Two screening methods; a laboratory ‘microtest’ and an insectary test were used to determine the attractiveness of the genotypes to capsids. In addition, seedlings exposed to capsids in the insectary were observed under ‘ semi-field’ conditions to as...
ABSTRACT Mycobacterium ulcerans disease (Buruli ulcer) is increasing worldwide but there is currently no effective chemotherapeutic treatment. Prevention and control has also not been possible because the mode of transmission remains illusive and at best speculative. Recent investigation however points to the possible involvement of aquatic bugs belonging to the familily Naucoridae in the transmission process. In the laboratory, infected Naucorid species have been shown to transmit the bacter...
ABSTRACT Toxicity and protectant potential of isoeugenol, limonene and essential oil of Hyptis spicigera against Sitophilus zeamais (Motsch.), Callosobruchus maculatus F. and Tribolium castaneum (Herbst.) and the effect of the oils on germination of maize and cowpea were investigated in the laboratory using contact toxicity, grain treatment and repellency assays. The effects of acetone extracts from leaf and seed of Hyptis spicigera on oviposition and adult emergence of C. maculatus were also...
ABSTRACT Cowpea [Vigna ungriculata (L.) Walp] is a leguminous plant and is one of the staple crops much cultivated in Benin and neighboring countries and in Africa as a whole. Cowpea production is hindered by many biotic and abiotic factors, with the flower bud Thrips, Megalurothrips sjostedti (Trybom) being the most damaging pest at flowering stage causing yield losses of 20 to 80%. Control of flower bud thrips in the field is difficult due to its cryptic behaviour. Thus, the combination of ...
ABSTRACT A study to determine the species range of parasitoids of Sesamia calamistis on maize in some selected maize farms in Accra was conducted on small holder farms at the University of Ghana. Legon, and its environs. Collections of stembororers were made in pre-selected fields and farms. These were then reared on freshly cut pieces of maize stem in 500-ml storage bottles in the laboratory, and observed for the emergence of parasitoids or stemborers. Emerging parasitoids were identified an...
ABSTRACT A survey was carried out in the Kwaebibirem District of the Eastern Region of Ghana to identify insect pests and natural enemies of upland rice both in the field and storage. The study lasted from September 1999 to October 2000. Field insects were sampled from five communities in the district i.e. Agricultural Research Station (ARS)-Okumaning, Subi, Abodom, Abaam and Prankese. Two line transects twenty five meters apart were fixed through each rice field. On the first line transect, ...
ABSTRACT Cabbage is an important crop for many smallholder farmers in Africa and Asia, due to its nutritional and financial benefits. It is one of the popular vegetables consumed and cultivated by both urban and rural dwellers in Ghana. The production of cabbage in Ghana, however, is faced with numerous constraints especially insect pest infestations. Farmers have limited control options and therefore resort to the use of synthetic insecticides. Indiscriminate use of these insecticides has l...
ABSTRACT Insecticide resistance due to knockdown resistance (kdr) mutations in Anopheles gambiae populations has been reported in neighbouring West African countries, such as Cote d’Ivoire, Burkina Faso and Benin despite the absence of large-scale mosquito control in these countries. The hypothesis is that agricultural or household use of insecticides is responsible for the evolution of resistance. However, studies relating such uses of insecticides and the development of resistance in An....
ABSTRACT The Black pyramid and Circle traps were evaluated with single and double combinations of gas chromatography grade of benzaldehyde (BZ) and essential oil (EO) obtained from the mango blossom to determine their performance in attracting the mango stone weevil in three commercial mango orchards located at Ayikuma, Kpong and Somanya all in Southern Ghana. Eight trap and lure treatment combinations consisting of (Pyramid trap only, Pyramid trap + BZ, Pyramid trap + EO, Pyramid trap + BZ +...
ABSTRACT This study sought to determine the most effective concentration and favourable temperature at which Methanol and Diethyl ether extracts of Eucalyptus sp leaf are most effective in the control of Sitophilus zeamais in stored maize. Bioassay on efficacy of Methanol and Diethyl ether extract of Eucalyptus sp leaf was carried out with 4 treatment concentrations of 0.2%, 0.4%, 0.8% and 1.2% dissolved in acetone at 0.5 g/L of solvent. The extract was replicated three times and stored at te...
ABSTRACT The effect of different soil amendment strategies, and neem products for the management of insect pests of okra was studied in the field at the Ashaiman irrigation project site. The insect pests encountered fell into seven orders belonging to twenty-three families. The important ones among these were Aphis gossypii (Glov.), Bemesia tabaci (Genn.), Dysdercus spp. Podagrica uniformis (Jac.), Heliothis armigera (Hb.) synonym Helicoverpa armigera (Hb,), Sylepta derogata (Fab.), Anthonomu...
ABSTRACT The effect of Neem Seed Water Extract (NSWE) on insects and growth performance of eggplant (local garden egg) was evaluated in the field from June to October 1998 at Ekoso in the Eastern region, Ghana. The extract was applied at the rate of 75 g of seed per litre of water and compared with a standard insecticide (Karate), a registered Bacillus thuringiensis Berl. (Biobit) and water only as control. The effect of each treatment on leaf, shoot and fruit damage caused by defoliators, sh...
ABSTRACT Livestock are important contributors to food production in Ghana, providing meat, milk and a source of income for many. Rearing of livestock is practiced by the majority of the farming communities in which they are considered as an investment and insurance against risk and to meet seasonal and emergency purchases such as food crop, improved seed, fertilizers and medicine. However, production of animals is constrained by compound effects of parasitic infestation, diseases, poor feedin...
Abstract Resistance to the cowpea aphid is important component of integrated pest management of cowpea cropping systems most especially at the vegetative stage. The objective of this study was to demonstrate the effectiveness of the aphid resistance locus identified in advanced breeding line SARC 1-57-2 in reducing damage from the cowpea aphid in Ghana. Using an F2 population developed from Apagbaala x SARC 1-57-2, the resistance locus was tagged with the SSR marker CP 171F/172R with a recom...