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Articles by T.A. Adebayo
Total Records ( 3 ) for T.A. Adebayo
  T.A. Adebayo , O.A. Olaniran and W.B. Akanbi
  The study evaluated the effectiveness of botanical pesticides Tephrosia vogelii and Petiveria alliacea for the control of insect pests in cowpea field. Extracts from the plants were compared with a synthetic insecticide, decis. The extract of Tephrosia vogelii was the most effective of the botanicals and ranked equal to that of synthetic insecticide decis in reducing the population density and damage caused by the insects prevalent in many experimental sites in southern Guinea Savannah of Nigeria. The importance of using botanicals as insecticides in developing countries is discussed in the study.
  O.A. Ojo , T.A. Adebayo and O.A. Olaniran
  The biological response of bacteria, actinomycetes, fungi and protozoan to four fungicides (Phenyl mercuric acetate, pentachloro-nitrobenzene, benomyl and captan) was investigated in a garden soil treated with three different rates of these fungicides. The microbial populations were estimated at different days after treatment using the standard dilution plate-count technique. Phenyl mercuric acetate completely inhibited the soil bacteria and fungi at all rates of application up till 33 Days After Treatment (DAT), after which recolonization of the soil occurred. The significantly (p 0.05) highest bacteria population of 22.11 x10 cfu g-1 and 16.03x10 cfu g-1 of actinomycetes population in soil was observed in the soil samples treated with benomyl at the application rate of 225.0 ìg g-1 and 63DAT when compared with that of untreated soil sample. Pentachloro Nitrobenzene (PCNB) gave significantly lowest (p 0.05) population of actinomycetes (0.03x10 cfu g-1) and protozoan (0.0x10 cfu g-1) compared to all other treatments throughout the period of study. The actinomycetes population in the captan and ceresan treated soils sample increases with days after treatment. In general, fungi and protozoa were more susceptible to fungicides than bacteria and actinomycetes. Phenyl mercuric acetate and pentachloro-nitrobenzene were more toxic particularly to soil, micro organisms, compared to benomyl and captan. The significant effects of fungicides on soil microbial population is here in discussed.
  T.A. Adebayo , O.A. Ojo and O.A. Olaniran
  Two insecticides were applied separately to the soil at 4000 and 8000 ppm for thiodan® and 6000 and 12000 ppm for karate®, respectively. Their effects were investigated at 0, 14, 21, 28, 35, 42 and 49 Days after Treatment (DAT) on the population of bacteria, fungi, actinomycetes and protozoa in the soil. The microbial population was estimated using the standard dilution plate technique. The two insecticides investigated at both rates of application significantly (p 0.05) reduced the fungi, actinomycetes and protozoa population in the soil. Whereas the bacteria population was significantly (p 0.05) increased. Thiodan at the rate of 8000 ppm gave significantly (p 0.05) lowest population of fungi in the soil compared to actinomycetes and protozoa population. A progressive increase in the soil microbial population for various insecticidal treatments in the order of 49DAT > 35DAT >28DAT > 21DAT > 14DAT > 0DAT was observed. The significance of thiodan and karate insecticide at two different rates of application on the soil microbial population is herein discussed.
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