title: Toxicity and physiological effects of neem pesticides applied to rice on the Nilaparvata lugens Stål, the brown planthopper.
abstract: The effects of two different neem products (Parker Oil and Neema) on mortality, food consumption and survival of the brown planthopper, Nilaparvata lugens Stål (BPH) (Homoptera: Delphacidae) were investigated. The LC(50) (3.45 ml/L for nymph and 4.42 ml/L for adult in Parker Oil treatment; 4.18 ml/L for nymph and 5.63 ml/L for adult in Neema treatment) and LC(90) (8.72 ml/L for nymph and 11.1 ml/L for adult in Parker Oil treatment; 9.84 ml/L for nymph and 13.07 ml/L for adult in Neema treatment) were identified by probit analysis. The LC(90) (equal to recommended dose) was applied in the rice field. The effective concentration of both Parker Oil and Neema took more than 48 h to kill 80% of the N. lugens. Fourth instar nymph and adult female N. lugens were caged on rice plants and exposed to a series (both LC(50) and LC(90)) of neem concentrations. Nymph and adult female N. lugens that were chronically exposed to neem pesticides showed immediate mortality after application in laboratory experiment. The quantity of food ingested and assimilated by N. lugens on neem-treated rice plants was significantly less than on control rice plants. The results clearly indicate the neem-based pesticide (Parker Oil and Neema), containing low lethal concentration, can be used effectively to inhibit the growth and survival of N. lugens.
authors.affiliation: Division of Biopesticides and Environmental Toxicology, Sri Paramakalyani Centre for Environmental Sciences, Manonmaniam Sundaranar University, Alwarkurichi, 627 412 Tirunelveli, Tamil Nadu, India. senthilkalaidr@hotmail.com
authors.forename: Sengottayan
authors.initials: S
authors.lastname: Senthil-Nathan
authors.forename: Man-Young
authors.initials: MY
authors.lastname: Choi
authors.forename: Chae-Hoon
authors.initials: CH
authors.lastname: Paik
authors.forename: Hong-Yul
authors.initials: HY
authors.lastname: Seo
authors.forename: Kandaswamy
authors.initials: K
authors.lastname: Kalaivani
mesh_terms: D000818:Animals; D031601:Azadirachta / Q000737:chemistry*; D005260:Female; D005989:Glycerides / Q000633:toxicity*; D006430:Hemiptera / Q000187:drug effects* / Q000254:growth & development; D007306:Insecticides / Q000633:toxicity*; D012275:Oryza; D013729:Terpenes / Q000633:toxicity*; D018675:Toxicity Tests
chemical_list: D005989:Glycerides; D007306:Insecticides; D013729:Terpenes; C002443:neem oil