In this study, researchers studied the evolutionary effects on parasitoids of symbiont-mediated resistance by Acyrthosiphon pisum to the parasitoid, Aphidis ervi. They were able to take advantage of the parthenogenic life cycle of the aphid, allowing them to effectively rule out host evolution as the factor effecting results. They performed several experiments to determine what evolutionary eff...

Cryptomeria japonica var. sinensis Miquel in south China is currently overwhelmingly infested by a native caterpillar species, Dendrolimus houi (Lepidoptera), which causing severe economic losses and ecological disasters both planted natural forests. Our results include report of five parasitoid species eight flies within D. dominant endoparasitoid Kriechbaumerella dendrolimi , attacks pupae wi...

The effect of crop sequence on parasitism of second-stage juveniles (J2) of Heterodera glycines by Hirsutella rhossiliensis was investigated. Data were collected from plots of a long-term crop rotation experiment established in 1982. Crop sequences included (i) continuous monoculture of corn and soybean; (ii) annual rotation of the two crops; and (iii) 1, 2, 3, 4, or 5 years of each crop follow...

Carrot, a highly profitable crop in Israel, is severely damaged by Phelipanche aegyptiaca parasitism. Herbicides can effectively control the parasite and prevent damage, but for optimal results, knowledge about the soil-subsurface phenological stage of the parasite is essential. Parasitism dynamics models have been successfully developed for the parasites P. aegyptiaca, Orobanche cumana, and Or...

The immunopathological evaluation of the hepatic compartment associated with parasitism and biochemical findings are essential for understanding the genesis of hepatomegaly in canine visceral leishmaniasis (CVL). Three clinical groups of dogs naturally infected with Leishmania chagasi [i.e., asymptomatic (AD, n=12), oligosymptomatic (OD, n=12) and symptomatic (SD, n=17)] were assessed and compa...

The rates of parasitism of Theridion evexum by the parasitoid wasp Zatypota petronae, and Allocyclosa bifurca by Polysphincta gutfreundi, were followed for two years. Parasitism of T. evexum was very low (mean 1.39 +/- 1.8%), and restricted to nearly seven months of the year. Parasitism of A. bifurca was higher (mean 7.8 +/- 7.6%), and did not show a seasonal pattern. Reproduction of the host s...

Roundworms of the Nematoda comprise one of the largest animal phyla on Earth (1). They inhabit diverse terrestrial and aquatic niches through adaptations of a spectrum of trophic groups, including parasites that threaten human, animal and crop plant health. The most well-known nematode, Caenorhabditis elegans, is a native soil-dwelling microbivore that has emerged as a premier model for animal ...