The neonicotinoids are the newest major class of insecticides modeled after the basic nicotine molecule having improved insecticide activity and generally low toxicity. The insecticidal activities of neonicotinoids were previous studied using 3D and standard partial least squares regression models. The paper describes the ability of the MDF SAR methodology in prediction of insecticidal activiti...

A series of 2'(2',6')-(di)halogeno-isoxazolopodophyllic acids-based esters, and oxime sulfonates of 2'(2',6')-(di)halogenopodophyllones were prepared by structural modifications of podophyllotoxin as insecticidal agents against Mythimna separata Walker. It was found that when 2'(2',6')-(di)halogenopodophyllones or 2'(2',6')-(di)chloropicropodophyllones reacted with hydroxylamine hydrochloride, ...

laboratory bioassays were carried out to study the insecticidal efficacy of two iranian diatomaceous earths (des) and silicosecâ® formulation against sitophilus granarius (l.). four different particle sizes of des were applied at five concentrations. the mortality was counted 2, 5 and 7 days after exposure. the experiment was carried out at 27 â± 1â°c and 55 â± 5% relative humidity in continuou...

The objective of the current study was to evaluate altitudinal variability in chemical compounds, nematicidal, insecticidal, herbicidal, and antifungal activity essential oils H. coronarium collected from four different habitats Tarai Kumaun region Uttarakhand. Essential were hydro-distilled rhizomes coronarium, their yield varied 0.05 0.25% (v/w). Based on GC-MS analysis, major compounds obser...

The hypothetical impact of conventional insecticidal spraying strategies on Tsetse fly is investigated in this work. The investigation is largely one of the effect of temperature on tsetse population dynamics and its reproductive cycle during spraying, given that cooler weather is preferred for the settling of insecticidal droplets. Conventional insecticidal spraying strategies are found to be ...

Thuringiensin (Thu), also known as β-exotoxin, is a thermostable secondary metabolite secreted by Bacillus thuringiensis. It has insecticidal activity against a wide range of insects, including species belonging to the orders Diptera, Coleoptera, Lepidoptera, Hymenoptera, Orthoptera, and Isoptera, and several nematode species. The chemical formula of Thu is C22H32O19N5P, and it is composed of a...

Twenty-five field isolates of Bacillus thuringiensis from the Lower Silesia region of Poland, the Osola plain, and phylloplane niches and soil samples from the Karkonosze National Park were tested for insecticidal activity against larvae of the dipterans Aedes aegypti, Drosophila melanogaster and Musca domestica. The spore-crystal mixture of B. thuringiensis finitimus (soil isolate) killed near...

Batch and fed-batch cultivation of Bacillus thurillgiellsis var. kurstaki was carried out to achieve high cell and spore density with maximum insecticidal activity. Cell cultivation was done in fully equipped fermentors under controlled conditions at different feed rates. Increased cell mass, high spore counts and improved insecticidal activity were achieved with fed-batch cultivation system. W...

Bacillus cereus is mainly known as a human food-borne opportunistic pathogen. Here, we used biological assays and HPLC to investigate the ability of B. cereus to produce insecticidal exotoxins during the stationary growth phase. None of the 575 B. cereus strains screened produced detectable levels of beta-exotoxin I, a small, heat-stable insecticidal nucleotide analogue. However, six out of a s...

Proteases from a variety of sources (viruses, bacteria, fungi, plants, and insects) have toxicity towards insects. Some of these insecticidal proteases evolved as venom components, herbivore resistance factors, or microbial pathogenicity factors, while other proteases play roles in insect development or digestion, but exert an insecticidal effect when over-expressed from genetically engineered ...