Insecticidal potential of botanical plants (allium sativum, carica papaya, eucalyptus sp) on the control of pests of couch (brassica oleracea) in the locality ebolowa (south-Cameroon)

The main aim of the present study, carried out in the southern Cameroon region, was to assess the insecticidal potential of a number of botanical plants, namely garlic (Allium sativum), papaya leaf (Carica papaya) and eucalyptus leaf (Eucalyptus sp), in controlling cabbage (Brassica oleracea) pests. The experimental set-up was completely randomized, with 03 blocks containing 05 treatments (T0: negative control, T1: garlic treatment, T2: papaya leaf treatment, T3: eucalyptus leaf treatment, T4: chemical treatment). The various pests were identified. Physiological growth parameters (number of leaves, stem height, collar diameter, leaf area) were recorded and evaluated. Pest prevalence was determined by the number of perforated leaves. Statistical analyses were performed using SPSS software. ANOVA, SNK and Tukey variance tests were performed. The results show that the various pests identified were: Dysdercus subfasciatus, Nezara virudula, Helix pomatia, Orthoporus ornatus, Plutella sp and Formicidae. Treatment T1 (based on garlic extract) showed a considerable difference in leaf number (11.47±4.59), stem height (6.03±1.96 cm) and collar diameter (0.2±0.041 cm), while T2 (based on papaya leaf) had a considerable effect on leaf area (246±4.28 cm2) and T3 (based on eucalyptus leaf) a considerable effect on leaf diameter (0.2±0.041 cm).