The present work reports the differences between the ovarian grow in queen and worker larvae of A. mellifera, from the start of differential feeding. The observations made of the growth rates in larvae of both castes showed that the queen and worker larvae have the same rates of cephalic capsule growth from one instar to another but the weight gain is greater in queens. In the same way, the dra...

Toxicity of a phenyl pyrazole insecticide, fipronil, to 4th-instar larvae of 6 species of colonized mosquitoes (Aedes aegypti, Ae. albopictus, Ae. taeniorhynchus, Anopheles quadrimaculatus, Culex nigripalpus, and Cx. quinquefasciatus) and 2 species of field-collected chironomid midges (Chironomus crassicaudatus and Glyptotendipes paripes) was evaluated in the laboratory. All mosquito species we...

The proliferation of disease-vector mosquitoes has been attributed to the effects of land-use change. We investigated the relationship between land use, macroinvertebrate communities, and water chemistry in water-filled containers in native forest, pasture land, and urban land at two locations (Waikanae and Paraparaumu) in the Kapiti region, New Zealand. Larvae of the endemic Culex pervigilans ...

Instar determination of field-collected insect larvae has generally been based on the analysis of head capsule width frequency distributions or bivariate plotting, but few studies have tested the validity of such methods. We used head capsules from exuviae of known instars of the beet armyworm, Spodoptera exigua (Hübner) (Lepidoptera: Noctuidae), to determine the larval instars with the frequen...

A recently isolated haemolymph protein appears to be an important regulator of ecdysone biosynthesis by prothoracic glands in Manduca sexta. Using a dose-response titration protocol, the haemolymph titre of this stimulatory factor was determined during the last larval instar. The titre was high (greater than 2.0 U ml-1) on days 0 and 1, then dropped significantly to 0.55 U ml-1 on day 2, and re...

The silkworm, (B. mori L). is highly susceptible to pathogens such as protozoa, virus, bacteria and fungus. To evaluate the various bed disinfectant viz, Vijetha, Sericilin, Labex, Amla compare with untreated control for their suitability standardization management of diseases during silkworm rearing. rearing multivoltine hybrid race [NISTARI × (SK6×SK7)] was carried out in centre. In present s...

Bradysia odoriphaga (Diptera: Sciaridae) is the most important pest of Chinese chive (Allium tuberosum) in Asia; however, the molecular genetics are poorly understood. To explore the molecular biological mechanism of development, Illumina sequencing and de novo assembly were performed in the third-instar, fourth-instar, and pupal B. odoriphaga. The study resulted in 16.2 Gb of clean data and 47...

This study was carried out to evaluate the biological effects of methanolic, acetone and petroleum ether leaves extract Artemisia absinthium against 1st instar larvae Chrysomya albiceps. All extracts have toxicity C. The larvicidal, pupicidal adulticidal activity these varied depending on solvent used in extraction dose extract. Complete larval mortality percent (100%) caused only by at 0.4g/ml...

The third instar larvae of Gepus invisus and Solter liber are comparatively described and illustrated for the first time with a particular emphasis on genus level characters. Larval morphology confirms a close relationship between these genera as they differ only in minor characters.

Fluorescence in situ hybridization of Anopheles darlingi and A. nuneztovari demonstrated nucleolar organizer region activity at the end of the fourth larval instar, when the nucleolar organizer regions underwent gradual condensation. The heteromorphic sex chromosomes showed intraindividual size variation in the rDNA blocks located in the pericentromeric region and this coincided with the locati...