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Effects of some insecticidal plants and their application rates on adult mortality and progeny development of Maize Weevil, Sitophiluszeamais (Motsch) in Stored Maize Grain

Author Affiliations

  • 1Department of Plant Science, Bedelle College of Agriculture and Forestry, Mettu University, Ethiopia
  • 2Sasakawa Global 2000 Ethiopia, Addis Abeba
  • 3Haramaya University, School of Plant Science, Haramaya, Ethiopia

Res. J. Agriculture & Forestry Sci., Volume 9, Issue (3), Pages 19-27, July,8 (2021)


A study was conducted to evaluate the effects of some of insecticidal plants and their rate of application on adult parent mortality and progeny development of maize weevil in infested maize grain. Seven botanicals (Azadirachta indica (neem), Melia azedarach (melia), Parthenium hysterophorus (parthenium), Calpurnia aurea (calpurnia), Vernonia amygdalina (bitter leaf), Carica papaya (papaya) and Dichrocephala integrifolia were tested each at three different rates viz, 2.5, 5 and 10% w/w. Malathion 5% dust at 0.05% as standard check and untreated check were included for comparison. The experiment was laid out in a completely randomized design (CRD) in factorial arrangement and replicated four times. Data on parent mortality and progeny development were collected. Parent mortality was assessed at 3, 10, 17, 24 and 31 days after treatment (DAT). F1 progeny was assessed from 35 to 75 DAT, but data analysis was done for counts after 45 to 65 DAT. The results showed that the F1 progeny development was highly significantly (P≤0.01) affected by the botanicals, while the parent adult weevil mortality was highly significantly (P≤0.01) affected by the botanicals and rate of application. Among the tested botanicals, A. indica caused the highest adult mortality (100%) at variable durations and highly inhibited the F1 progeny development (3.5) at 65 DAT. All of the botanicals showed insecticidal property but the degree of their efficiency varied with the rate of application and duration of storage. D. integrifolia and M. azedarachat 10% w/w resulted in highest cumulative parent weevil mortality (100%). The treatments of D. integrifolia and M. azedarach also resulted in low progeny emergence (7.25 and 6.5, respectively).


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