Efficacy of neem, pongamia and fish oils alone and as synergists with insecticides for the management of whitefly, Bemisia tabaci (Gennadius) on tomato

V. SRIDHAR, S. ONKARA NAIK, K. ACHALA PARIPURNA, V. K. RAO, K. G. PILLAI, D. C. LAKSHMANA REDDY

Abstract


Insecticides alone and in combination with neem, pongamia and fish oils were evaluated against whitefly,
Bemisia tabaci on tomato under Poly house conditions. Among the insecticides tested, spinosad followed by imidacloprid
and fipronil were effective against B. tabaci and recorded a mortality of 84.55%, 84.17% and 79.39%, respectively. When
neem/pongamia/fish oils were used together @ 3ml/l each, resulted in 75% mortality of B. tabaci. Oils alone gave upto
48.75% mortality of B. tabaci. All the oils showed synergism with different insecticides tried against whitefly and highest
synergism was recorded with neem oil followed by fish oil and pongamia oil. Additional mortality upto16% of B. tabaci was
observed when these oils were used along with different insecticides. Neem oil in combination with spinosad gave upto
92.31% mortality of whitefly followed by spinosad with fish oil (91.68% mortality). Other effective combinations with neem
oil were imidacloprid (89.67%) and fipronil (89.38%). In general, neem and fish oils were promising as synergists with the
insecticides tried against whitefly on tomato.


Keywords


Whitefly; Bemisia tabaci; neem oil; pongamia oil; fish oil; synergists

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