insect natural enemies selected for such specific traits as faster developmental times, longer survivor, increased fecundity, and larger body size might be considered during production of biological control agents in certain situations. for instance, traits related to developmental rates may be selected for, if genetically based variation exists within temperature-dependent responses. hippodami...

Po premiĂŠrĂĄch her Julia Zeyera se scĂŠnickou hudbou Josefa Suka (RadĂşz a Mahulena Pod jablonĂ­) někteří čeĹĄtĂ­ kritici konfrontovali SukĹŻv zpĹŻsob uĹžitĂ­ melodramu v činohře s Fibichovou HippodamiĂ­. Toto srovnĂĄvĂĄnĂ­ plynulo z rozdĂ­lnĂ˝ch nĂĄzorĹŻ na melodram obecně. Podle některĂ˝ch kritikĹŻ FibichĹŻv zĂĄměr doprovodit celĂŠ drama zpĹŻsobil, Ĺže je mnoha pasåŞích zbytečnĂ...

Heritable symbionts have been found to mediate interactions between host species and their natural enemies in a variety of organisms. Aphids, their facultative symbionts, and their potential fitness effects have been particularly well-studied. For example, the aphid facultative symbiont Regiella can protect its host from infection from a fungal pathogen, and aphids with Hamiltonella are less li...

A series of bioassays were conducted to determine the relative toxicities and residual activities of insecticides labeled for use in blueberry (Vaccinium corymbosum L.) on natural enemies, to identify products with low toxicity or short duration effects on biological control agents. In total, 14 insecticides were evaluated using treated petri dishes and four commercially available natural enemi...

Studies were conducted in 1994 and 1995 to examine the effects of a range of action thresholds for managing Bemisia tabaci (Gennadius) Biotype B (= B. argentifolii Bellows & Perring) with insecticides in cotton on populations of arthropod predators in Imperial Valley, CA, and Maricopa, AZ. Application of insecticides significantly reduced population densities of spiders, Geocoris punctipes (Say...

We combined two protein-marking enzyme-linked immunosorbent assays (ELISA) with a predator gut content ELISA to monitor the movement and feeding activity of commercially-purchased Hippodamia convergens Guèrin-Mèneville (Coleoptera: Coccinellidae) under realistic field conditions during two field seasons in central Arizona. The proteinmarking ELISAs were used to differentiate released H. converg...

We developed a computer program for life table analysis using the open source, free software programming environment R. It is useful to quantify chronic nonlethal effects of treatments on arthropod populations by summarizing information on their survival and fertility in key population parameters referred to as fertility life table parameters. Statistical inference on fertility life table param...