Efficacy of Different Botanicals and Insecticide against Chafer Beetles on Jamun (Syzygium cumini L.)

DOI: 10.22161/ijeab.115.16

Abstract:
The present investigation was conducted to evaluate the efficacy of different botanical and chemical treatments against chafer beetles infesting jamun (Syzygium cumini L.). Seven treatments, comprising neem oil (2.0 ml/litre), karanj oil (2.0 ml/litre), mahua oil (2.0 ml/litre), Bacillus thuringiensis (2.0 g/litre), neem seed kernel extract (NSKE) 5% (50 g/litre), lambda-cyhalothrin 5% EC (1.0 ml/litre), and an untreated control, were evaluated through three consecutive sprays. The pooled results revealed considerable variation in treatment efficacy against chafer beetles. Among the treatments, lambda-cyhalothrin 5% EC recorded the lowest pooled mean infestation value of 7.47 (15.86), followed by NSKE 5% at 8.68 (17.13), neem oil at 10.07 (18.50), Bacillus thuringiensis at 10.95 (19.32), karanj oil at 11.57 (19.89), and mahua oil at 12.82 (20.98). The untreated control recorded the highest pooled mean value of 17.63 (24.83). The critical difference at the 5% level was 2.87 for the pooled mean, indicating significant differences among treatments. The results demonstrated that lambda-cyhalothrin 5% EC was the most effective treatment for managing chafer beetles on jamun, followed by NSKE 5% and neem oil. Among the botanical treatments, NSKE 5% showed the greatest efficacy.

Keywords:
Jamun, Syzygium cuminii, chafer beetle, botanical pesticides, NSKE, Bacillus thuringiensis, lambda-cyhalothrin, pest management.

Article Info:
Received: 08 Sep 2026; Received in revised form: 05 Oct 2026; Accepted: 07 Oct 2026; Available online: 15 Oct 2026

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