Journal ArticleDOI
A method of computing the effectiveness of an insecticide
TLDR
In order to make experimental studies comparable and statistically meaningful, the article recommends the following formula: per cent control = 100(X - Y)/X, which eliminates errors due to deaths in the control sample which were not due to the insecticide.Abstract:
There are several statistical methods used in biology (entomology) for computing the effectiveness of an insecticide, based on relating the number of dead insects in the treated plat to the number of live ones in the untreated plat. In order to make experimental studies comparable and statistically meaningful, the article recommends the following formula: per cent control = 100(X - Y)/X, where X = % living in the untreated check sample and Y = % living in the treated sample. Calculation using this method eliminates errors due to deaths in the control sample which were not due to the insecticide. An example based on treatments of San Jose scale includes computation of probable errors for X and Y, and the significance of the difference between the two counts. Common biometric convention holds that when the difference between the results of two experiments is greater than three times its probable error, the results are significant and due to the treatment applied.read more
Citations
More filters
Journal ArticleDOI
Influence of grain type on the insecticidal efficacy of two diatomaceous earth formulations against Rhyzopertha dominica (F) (Coleoptera: Bostrychidae).
Nickolas G. Kavallieratos,Christos G. Athanassiou,Foteini G. Pashalidou,Nickolas S. Andris,Zeljko Tomanovic +4 more
TL;DR: Evaluated diatomaceous earth formulations against adults of Rhyzopertha dominica in eight different grain commodities revealed that reproductive capacity in all the treated grains was significantly suppressed when compared with untreated grains, and the degree of DE adherence to a given grain was not always indicative of the effectiveness of DE against R dominica.
Journal ArticleDOI
Effect of Temperature on Germination, Radial Growth and Virulence of Metarhizium anisopliae and Beauveria bassiana on Megalurothrips sjostedti
TL;DR: The effect of temperature on germination, radial growth and pathogenic activity of two strains of Beauveria bassiana and four strains of Metarhizium anisopliae on the legume flower thrips, Megalurothrips sjostedti, was studied in the laboratory.
Journal ArticleDOI
Susceptibility to neonicotinoids and risk of resistance development in the brown planthopper, Nilaparvata lugens (Stål) (Homoptera: Delphacidae).
TL;DR: Long-term use of imidacloprid in a wide range of rice-growing areas might be associated with high levels of resistance in N. lugens, and insecticide resistance management strategies must be developed to prevent further increase in resistance.
Journal ArticleDOI
Novel nicotinic action of the sulfoximine insecticide sulfoxaflor.
Gerald B. Watson,Michael R. Loso,Jonathan M. Babcock,James M. Hasler,Theodore J. Letherer,Cathy D. Young,Yuanming Zhu,John E. Casida,Thomas C. Sparks +8 more
TL;DR: The nature of the interaction of sulfoxaflor with nAChRs apparently differs from that of IMI and other neonicotinoids, and when coupled with other known characteristics, indicate that sulf oxaflor represents a significant new insecticide option for the control of sap-feeding insects.
Journal ArticleDOI
Larvicidal activity of neem oil (Azadirachta indica) formulation against mosquitoes
Virendra K. Dua,Akhilesh C Pandey,Kamaraju Raghavendra,Ashish Gupta,Trilochan Sharma,Aditya P Dash +5 more
TL;DR: The neem oil formulation was found effective in controlling mosquito larvae in different breeding sites under natural field conditions and may prove to be an effective and eco-friendly larvicide, which could be used as an alternative for malaria control.