Weight Gain Of Larvae Research Articles

Anti-feedant activity of the polyacetylene, phenylheptatriyne (PHT), from the Asteraceae toEuxoa messoria (Lepidoptera: Noctuidae)

Phenylheptatriyne (PHT), a polyacetylene from various species of Asteraceae reduced feeding and weight gain of larvae of the polyphagous insectEuxoa messoria when incorporated into an artificial diet at concentrations of 10–300 ppm. These results suggest a role as insect antifeedants for the widely distributed polyacetylenes of the Asteraceae.

Weight Gain of Cereal Leaf Beetle Larvae on Normal and Induced Leaf Pubescence1

Seeds of wheat (Triticum aestivum L.) germinated and grown in closed petri dishes consistently produced leaves with more pubescence than those grown under natural conditions. Weight gain and percent survival of freshly emerged cereal leaf beetle larvae were measured on seedling plants with increased amounts of pubescence and control plants with normal pubescence.Larval weight gain on plants of cultivars susceptible and resistant to the cereal leaf beetle with increased densities of pubescence were significantly lower than the weight gain of larvae grown on control plants. These results make it possible to examine the contribution of pubescence to resistance within a single genotype in a manner similar to those comparisons in which pairs of isogenic lines are used.