Showing papers by "Makerere University published in 1985"
TL;DR: It is concluded that under conditions of annual cropping natural enemies are probably of lesser importance than other regulating factors.
Abstract: This paper reviews and analyses literature on the effect of plant species diversity on crop pests. It is observed that populations of several crop insect pest species are depressed under conditions of plant species diversity. The factors responsible for this depression are: parasites, predators, masking, camouflage, repellency, less colonization, resource concentration, unfavourable microclimate, physical obstraction and trap cropping. Natural enemies account for more than half of the cases where the pest population was claimed to be regulated in the weed-diversity systems. However, under conditions of crop-crop diversity, natural enemy action accounted for less than a third of the cases reviewed. It is further observed that most of the reviewed crop-crop diversity systems were of annual crops. It is therefore concluded that under conditions of annual cropping natural enemies are probably of lesser importance than other regulating factors.
65 citations
TL;DR: In this article, a model of the Standard African lithosphere was constructed using regional Bouguer anomalies (Brown and Girdler, 1980) and the deviation of the lithospheric thickness in Uganda from that of the standard value was calculated using the difference between the averaged Bouguers anomaly at a given point and the standard one.
12 citations
TL;DR: In this paper, the authors analyze the factors that determine the effectiveness of women's groups as vehicles of agricultural extension and are based on field data gathered on women's group in three districts of Kenya in 1981.
6 citations
TL;DR: Composition chimique des complexes obtenus avec de tres nombreux carbohydrates as discussed by the authors, with mesures de conductivite and de rotation optique, is described in detail.
4 citations
TL;DR: In this paper, conductimetric, potentiometric and titrimetric studies of aqueous telluric acid at pH 4.8-11.0 in the presence of acyclic hexols were conducted.
4 citations
3 citations
2 citations
TL;DR: The effects of repellents, surface texture, shape and colour to insect behaviour and host plant resistance under single-plant species resistance and plant population resistance are reviewed and discussed.
Abstract: This paper discusses insect behaviour and host plant resistance under single-plant species resistance and plant population resistance. Under single-plant species resistance, the effects of repellents, surface texture, shape and colour to insect behaviour are briefly reviewed and discussed. The effects of plant species diversity and plant density on insect behaviour are discussed under plant population resistance. Where possible, this discussion is illustrated with examples from recent behavioural studies on the weevil, Sitona lineatus L.
2 citations
TL;DR: Combination of high pressure syringe lavage with povidone-iodine and systemic penicillin-streptomycin given at the time of lavage sufficiently reduced the bacterial numbers to allow for safe closure of the wounds.
Abstract: The effectiveness of high pressure pulsatile lavage and syringe lavage in cleansing experimentally contaminated and infected wounds was studied. Such treatment significantly (P < 0.05) lowered the bacterial counts in contaminated wounds, but high pressure pulsatile lavage caused extensive damage to tissue and was considered to be unsuitable for treatment of wounds in the loose skin areas of the dog. Both pulsatile and syringe lavage caused significant (P < 0.05), but transient, reduction in the bacterial counts in infected wounds but both methods failed to lower the wound bacterial counts to 105 or less. Successive wound biopsies for quantitative bacterial analysis showed that syringe lavage with povidone-iodine caused greater reduction in bacterial numbers than did pulsatile lavage with povidone-iodine. Combination of high pressure syringe lavage with povidone-iodine and systemic penicillin-streptomycin given at the time of lavage sufficiently reduced the bacterial numbers to allow for safe closure of the wounds.
1 citations
1 citations