Comparative evaluation of some chitin synthesis inhibitors as insecticides against Colorado beetle Leptinotarsa decemlineata Say

Abstract

The bioactivity of the chitin synthesis inhibitors, chlorfluazuron, hexa‐flumuron, teflubenzuron, triflumuron and GR 572(novaluron) used in commercial or experimental formulations against larvae of Colorado beetle, Leplinotarsa decemlineata Say in laboratory and field experiments was evaluated during 1985–90. All compounds showed high potential for control of the pest. The activity mainly depended on the period of time after treatment. Higher activity was found on younger larvae. A shailow dose‐response relationship was observed for a given larval stage, particularly at the last observation, 15 days after treatment. A single treatment is able to suppress the pest population density below a dangerous level during the whole season. Observations showed that long‐term activity resulted from stomach and contact larvicidal action, reduced egg viability and antifeedant effect.

Field efficacy of novaluron for control of Colorado potato beetle (Coleoptera: Chrysomelidae) on potato

“…Control of third and fourth instars is especially important since these stadia are usually responsible for over 90% of the defoliation caused by L. decemlineata (Hare, 1990). Malinowski and Pawinska (1992) found that a single treatment of novaluron suppressed univoltine populations below economic levels throughout the whole season in Poland. However, since at least two L. decemlineata generations occur in southern Ontario, it is unlikely that a single application would have provided adequate treatment throughout the season.…”

“…While incompatibility with natural enemies has been reported (Cutler et al, 2006), the compound generally is selective in favor of non-target organisms (Ishaaya et al, 2001(Ishaaya et al, , 2002Cabrera et al, 2005), giving it good potential in integrated pest management (IPM). Novaluron has demonstrated good insecticidal activity against L. decemlineata in laboratory and field experiments (Malinowski and Pawinska, 1992;Linduska et al, , 2002Sewell and Alyokhin, 2003;Cutler et al, 2005a ) was supplied by United Agri Products (Dorchester, Ont., Canada).…”

Effect of Diflubenzuron on Flight of Adult Aquatic Insects (Plecoptera, Trichoptera) following Emergence During the Second Year After Aerial Application

“…Laboratory bioassays indicated that triflumuron did not cause significant mortality in Coccidoxenoides peregrinus, a parasitoid of the mealybug, Pseudococcus longispinus (Wakgari and Giliomee 2003). Most of these compounds have low soil persistence and high residual activity on foliage (Cutler et al 2005b;Malinowski and Pawinska 1992;Tuttle and Ferro 1988). Thus, the use of these insecticides may allow build up of the population of at least some natural enemies compared with chemical insecticides of broader spectrum action.…”

“…Malinowski and Pawinska (1992) studied the effect of chlorfluazuron, teflubenzuron, hexaflumuron, triflumuron and GR 572 on L. decemlineata. They also reported that triflumuron was less effective than other benzoylphenyl ureas.…”

Síntese, degradação e funções da membrana peritrófica dos insetos

“…al. (1993) A inibição da síntese de quitina também pode ser uma estratégia para o controle de insetos (Malinowski & Pawinska, 1992), uma vez que inibidores da quitina sintase têm sido utilizados com sucesso como inseticidas. Esses inibidores provocam alterações na estrutura da MP (Peters, 1992).…”