Int. J. Biosci.17( 2), 149-157, August 2020
A study was conducted to evaluate the effects of four different insecticidal plants (Dysphania ambrosoides, Hyptis Suavelons, Sphaeranthus suaveleons and Ocimum suave) in reducing pest abundance and damage in common bean under field conditions in Moshi, Tanzania. The experiment was laid out using a randomized complete block design (RCBD) with five (5) replications. Results indicated that the marginal insecticidal plants reduced insect pest abundance significantly (p<0.001) compared with the control plots without the field margin plants. Results for pest infestation indicated that there was a significant (p<0.001) difference in incidence and severity of insect pest from 2nd to 8th week on common bean growth. The highest overall pest’s incidence (78%) and severity (5.00) were observed in the control treatment compared with those recorded in plots surrounded by inscectidal plants. Overall, the lowest incidence and severity were recorded in plots surrounded by O.suave (3.4% and 0.200) and S.suaveleons (4.8% and 0.400). Based on these results, field margins with inscectidal plants particularly O.suave and S.suaveleons are recommended in bean production in Tanzania. Further research is recommended on exploring these insecticidal plants for possible application on the same and other crop systems in different agro-ecological regions of Tanzania.
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