The efficacy of neem product (phytopesticide FWB) was compared with perfekthion against sucking pests of cotton (jassids, thrips and whiteflies). Perfekthion proved to be more toxic but its effect lasted for 4 days only while neem product (FWB) was less toxic but its effect lasted for 6 days. Moreover, neem product is much safer and non-polluting.
ASLAM, MOHAMMAD and NAQVI, SYED NAIM-UL-HASAN (2000) "The Efficacy of a Phytopesticide in Comparison with Perfekthion Against Sucking Pests of Cotton," Turkish Journal of Zoology: Vol. 24: No. 4, Article 8. Available at: https://journals.tubitak.gov.tr/zoology/vol24/iss4/8