EFFICACY OF NEEM FORMULATIONS COMPARED TO CHEMICAL INSECTICIDES AGAINST HOPPERS AND LEAF WEBBER

Neem formulations consisting Azadirechtin are safer, cheaper and environment friendly.
Presently, several of these compounds have been registered in India and are available in the market.
Studies conducted in 1996–97 and 1997–98 against two major pests of mango.
The hoppers and leaf webber Orthaga euadrusalis walker indicted that freshly prepared 4% neem seed kernel extract (NSK) and 0.2% nimbicidine and deltamethrin gave significant reduction in hopper population (16 and 15.5 hopper per 5 panicles as compared to control (47.6 hopper per 5 panicles). These were at par with cypermethrin (0.0025%) and imidacloprid (0.002%) and monocrotophos (0.05%). Population of pollinators was not affected.
NSK at 4% effectively reduced hopper population upto 50% even after 7 days of spray, which was comparable to deltamethrin and cypermethrin and better than quinalphos.

Against leaf webber, Nimbicidine 0.2% and Nemactine 0.4% were better than carbaryl 0.1% and somewhat at par with endosulfan (0.07%) and imidacloprid (0.02%). Neem formulations such as Rakshak (0.2%), Neem gourd (0.4%) were inferior to the above and vangourd (0.4%) was the most inferior to the 4^th instar larvae.

VI International Symposium on Mango

G. Singh

Orthaga euadrusalis, Azadirechtin, Imidacloprid, Nimbicidine

https://doi.org/10.17660/ActaHortic.2000.509.87