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Acute and sublethal toxicity of novaluron, a novel chitin synthesis inhibitor, to Leptinotarsa decemlineata (Coleoptera: Chrysomelidae)
Author(s) -
Christopher Cutler G,
ScottDupree Cynthia D,
Tolman Jeffrey H,
Ronald Harris C
Publication year - 2005
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/ps.1091
Subject(s) - novaluron , leptinotarsa , colorado potato beetle , larva , toxicology , biology , zoology , insect growth regulator , instar , horticulture , botany
The acute and sublethal toxicities of novaluron, a novel chitin synthesis inhibitor, to a laboratory‐reared insecticide‐susceptible strain of Colorado potato beetle, Leptinotarsa decemlineata (Say), were determined. Novaluron exhibited excellent residual (120 h LC 50 = 0.42 mg litre −1 ) and good direct contact (120 h LC 50 = 27 mg litre −1 ) activity against second‐instar larvae (L2). Hatch of eggs exposed by direct contact to novaluron solutions ≥100 mg litre −1 was significantly reduced, as was the ability of emerged first‐instar larvae to moult. L2 from eggs exposed to ≥100 mg litre −1 novaluron weighed significantly less ( P < 0.0001) than those from untreated eggs. However, L2 from eggs treated with 1 mg litre −1 novaluron weighed significantly more ( P ≤ 0.05) than those from untreated eggs, suggesting novaluron can have a hormetic effect on L decemlineata larval development. Leptinotarsa decemlineata mating pairs fed foliage treated with novaluron at 25 or 75 g AI ha −1 produced approximately 25% fewer egg masses and eggs per mass. Hatch of eggs on treated foliage was almost completely suppressed, and longevity of male beetles was reduced by approximately 50% when fed foliage treated with novaluron at 75 g AI ha −1 . Copyright © 2005 Society of Chemical Industry