Methods and growth chambers are described which permit in situ estimates of the growth rates of chironomid larvae inhabiting litter accumulations in lotic habitats. Instantaneous growth rates (IGRs) for larvae of different sizes ranged from 0.01 to 0.24 mg mg-l ash-free dry mass (AFDM) d-l at stream temperatures of 2.9”15.1”C. IGRs were significantly and linearly related to temperature. Regress...

This study considered the effect of belief in race as a biological construct (RACEBIO) and intergroup anxiety (IGA) on in-group racial salience (IGRS) and out-group discomfort (OGD). Participants included 66 racially and ethnically diverse high school boarding students. As hypothesized, RACEBIO was positively related to both IGRS and OGD. In addition, the relationship between RACEBIO and IGRS w...

In a laboratory study, the insect growth regulator, cyromazine, exerted a high level of biological activity on Aedes aegypti and Culex quinquefasciatus treated in the 4th larval instar. At 1.5 and 1.0 ppm this IGR produced 97 and 99% inhibition of emergence in adult Ae. aegypti, respectively. In Cx. quinquefasciatus, there was 99% inhibition at 1 ppm and complete inhibition at 1.5 ppm. The over...

Insect growth regulators (IGRs) are a class of new chemicals that interfere with maturation and reproduction in insects. Proposed hypotheses on the biochemical mechanism of action are presented herein. The environmental aspects as metabolism in soils, plants, insects, and animals suggest strongly that these chemicals undergo rapid degradation and metabolism to innocuous metabolites. The toxicol...

Susceptibility to tebufenozide and methoxyfenozide of beet armyworm (Spodoptera exigua) from the southern United States and Thailand was determined through exposure of first and third instar larvae to dipped cotton leaves. LC50 estimates of first instar larvae ranged from 0.377 to 32.7 micrograms of tebufenozide per milliliter and 0.034 to 11.5 micrograms of methoxyfenozide per milliliter. LC50...

Mosquito control by pesticides remains the main intervention to reduce burden of mosquito nuisance and mosquito-borne diseases. In control, larviciding application environmentally friendly larvicides has been one routine operations. Larvicides based on microbial agents insect growth regulators (IGRs) account for most available products. Ones that are formulated using S-methoprene ranged from mi...

Abstract Drosophila suzukii (Diptera: Drosophilidae) is an invasive species that causes great damages to many stone and small fruits, resulting in reduced fruit production high economic losses. The concern about this pest has led the research of a wide range possible control methods. However, main strategies are still based insecticide applications. efficacy different insect growth regulators (...