Plant quality of dioecious hydrilla was studied as a factor that may influence larval survival, growth, and development of the biological control agent Bagous hydrillae. Nitrogen content and stem toughness of hydrilla varied among the five sites studied and between summer and fall collections. The nitrogen content of hydrilla collected during summer ranged from 1.2 to 3.6% (dry weight) and duri...

The corn earworm (Helicoverpa zea Boddie) is an important pest of corn (Zea mays L.), and its larvae sometimes cause severe ear damage to hybrids grown in the southeastern United States. The antibiotic compound isoorientin is present in silks of some corn inbreds at a concentration that is harmful to corn earworm larvae. The inbred T218, which produces biologically active levels of this compoun...

OBJECTIVE Volume overload from an incorrect assessment of dry weight leads to cardiovascular diseases in chronic hemodialysis patients. Dry weight assessment in pediatric is difficult for a number of reasons including growth. Blood volume monitoring (BVM) has been proposed as an accurate method of estimating dry weight in adult. However, there is very scant data regarding B VM assessment in ped...

The aim of this study was to determine the effects water extracts tarragon (Artemisia dracunculus L.) on feeding intensity, mortality, and weight gain selected pests, i.e., adult pea leaf weevils (Sitona lineatus L.), nymphs, wingless females black bean aphids (Aphis fabae Scop.), L2 L4 larvae Colorado potato beetle (Leptinotarsa decemlineata Say). In addition, effect voracity non-target organi...

Manduca sexta larvae are a model for growth control in insects, particularly for the demonstration of critical weight, a threshold weight that the larva must surpass before it can enter metamorphosis on a normal schedule, and the inhibitory action of juvenile hormone on this checkpoint. We examined the effects of nutrition on allatectomized (CAX) larvae that lack juvenile hormone to impose the ...

The differences in the seasons and environmental components considerably affect quality of multivoltine silk worm seed crop such as cocoon weight, shell ratio. Frequent fluctuations conditions day to season point up importance management temperature relative humidity for sustainable production basic farms. Hence know role seasonal on growth development Multivoltine silkworm, present study condu...

THIS STUDY DESCRIBES AND ILLUSTRATES THE LARVAE AND PUPAE OF TWO NORTH AMERICAN DARKLING BEETLES (COLEOPTERA: Tenebrionidae) in the subfamily Stenochiinae, Glyptotus cribratus LeConte from the southeastern United States, and Cibdelis blaschkei Mannerheim from California. Both species inhabit forested regions where adults and larvae occur in soft rotten dry wood of dead branches on living trees ...

Field and laboratory studies were conducted in 2000 and 2001 to determine the feasibility of mass marking western corn rootworm adults, Diabrotica virgifera virgifera LeConte, with RbCl in the field. Results showed that application of rubidium (Rb) in solution to both the soil (1 g Rb/plant) and whorl (1 g Rb/plant) of corn plants was optimal for labeling western corn rootworm adults during lar...

The leafminer Tuta absoluta (Meyrick) is a major pest of the tomato crop and its development rate is known to decline when nitrogen availability for crop growth is limited. Because N limitation reduces plant primary metabolism but enhances secondary metabolism, one can infer that the slow larval development arises from lower leaf nutritive value and/or higher plant defence. As an attempt to stu...

Seasonal polyphenism demonstrates an organism's ability to respond to predictable environmental variation with alternative phenotypes, each presumably better suited to its respective environment. However, the molecular mechanisms linking environmental variation to alternative phenotypes via shifts in development remain relatively unknown. Here we investigate temporal gene expression variation i...