Efficacy of biopesticides against the whitefly, Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae), on parthenocarpic cucumber grown under protected environment in India

Egyptian Journal of Biological Pest Control

Table 5 Efficacy of different biopesticides against nymphs of Bemisia tabaci on cucumber under net house conditions during autumn cropping season (2018)

Treatment	Concentrations (ml/l)	Percent reduction over control in nymphs of Bemisia tabaci per leaf *(mean ± SE) after different sprays
Treatment	Concentrations (ml/l)	1st spray	2nd spray	3rd spray	Overall reduction (%)
Beauveria bassiana (1 × 10⁹ CFU/ml)	10	46.0 ± 4.3^b	69.3 ± 3.5^d	85.8 ± 3.6^c	67.0 ± 11.5^a
Beauveria bassiana (1 × 10⁹ CFU/ml)	15	48.2 ± 5.9^ab	73.8 ± 2.1^bcd	89.9 ± 2.2^bc	70.6 ± 12.1^a
Lecanicillium lecanii (1 × 10⁹ CFU/ml)	10	46.0 ± 6.9^b	70.5 ± 4.0^cd	85.7 ± 2.6^c	67.4 ± 11.6^a
Lecanicillium lecanii (1 × 10⁹ CFU/ml)	15	50.6 ± 4.6^ab	75.3 ± 2.8^bcd	91.1 ± 2.6^bc	72.3 ± 11.8^a
Metarhizium anisopliae (1 × 10⁸ CFU/ml)	10	41.6 ± 9.8^b	65.5 ± 3.7^d	83.8 ± 0.6^c	63.6 ± 12.2^a
Metarhizium anisopliae (1 × 10⁸ CFU/ml)	15	46.1 ± 8.7^b	67.3 ± 4.4^d	85.9 ± 4.3^c	66.4 ± 11.5^a
Neem Baan (1% W/W)	10	57.8 ± 6.5^ab	79.8 ± 2.0^bc	94.5 ± 1.8^ab	77.4 ± 10.7^a
Neem Baan (1% W/W)	15	62.5 ± 6.4^ab	83.0 ± 1.6^ab	97.1 ± 1.0^ab	80.9 ± 10.0^a
Malathion 50 EC	4.0	77.7 ± 0.4^a	90.3 ± 1.9^a	99.5 ± 0.5^a	89.2 ± 6.3^a
F values		3.1	7.0	5.2	0.6
P		0.23	< 0.001	0.002	0.8

Percent reduction over control mean ± standard error of B. tabaci nymphs recorded after different sprays for bioassays performed with different commercial strains. Treatment columns bearing different letters are significantly different from other treatments according to Duncan’s multiple range test (DMRT) (P = 0.05). Range of pretreatment population nymphs = 14.9 to 18.0 nymphs/leaf
*Values represent means of 3 replicates