Showing papers in "Journal of Invertebrate Pathology in 1970"

TL;DR: The results indicate that the moisture and temperature conditions in the habitat of the pales weevil are suitable for development of the muscardine fungi, however, since both pathogens are restricted to certain insects for their development, they are unlikely to increase in abundance growing as saprophytes.

TL;DR: Preparations from fermentation beers of HD-1, a new isolate of Bacillus thuringiensis var.

TL;DR: A new term, the diet dilution unit, was defined and used to express potencies and calculate yields, and over 70% were obtained, and the ratios of spores to crystals did not change during the process.

TL;DR: Early-to-mid-instar nymphs are the most susceptible while adults show some degree of resistance, and healthy adults sometimes contain a low level of the virus without showing symptoms.

TL;DR: Observations indicated that the epizootic was density-dependent and that the rapid spread of pathogens in the susceptible population was enhanced by the behavior of the larvae during the early instars.

TL;DR: The spore-δ-endotoxin complex of Bacillus thuringiensis was recovered from beers produced by 12 variants of this bacterium grown in two fermentation media and activity could not be predicted from the variant, the amount of growth of the organism, or the medium.

TL;DR: The fine structure suggests that penetration of the epicuticle of the host by the fungus, while facilitated initially by mechanical pressure, is primarily enzymatic, and that Penetration of the procuticle is by mechanical separation of the cuticular laminae and fibrils, facilitated by enzymatics action.

TL;DR: Parasitism of Heliothis virescens by the parasitoid Cardiochiles nigriceps results in the production of about 200 teratocytes, which grow even when injected into hosts in the absence of the larval parasitoids.

TL;DR: The fine structure of germ tubes of the entomogenous fungus Metarrhizium anisopliae, and of appressoria formed by them in contact with the host integument, is described and the abundance of mitochondria, dictyosome, ribosomes, and endoplasmic reticulum in appressorial cells suggests a high level of secretory or metabolic activity.

TL;DR: The intracellular symbiotic microorganisms of cockroaches (Blattidae) possess cytological and ultrastructural features of both Grampositive and Gram-negative bacteria, as well as of rickettsiae, and are the only known symbiote of the Blattidae.

TL;DR: Levels of purity of at least 99% were achieved by using a method based on the principles of “triangulation” and countercurrent distribution chromatography to purify spores of Nosema heliothidus from infected larval Heliothis zea.

TL;DR: Two nuclear polyhedrosis viruses affecting the Douglas-fir tussock moth, Hemerocampa pseudotsugata, are described, one induces formation of polyhedral bodies containing single rod-shaped virus particles, each within its own envelope, and other produces polyhedra with bundles of several rods within a common envelope.

TL;DR: It was apparent that the recipients were capable of differentiating between allogsrafts and xenografts since host reactions directed at the latter were more rapid and generally more severe.

TL;DR: Studies confirmed that the granulosis virus of Trichoplusia ni is ultrastructurally similar to other granuloses.

TL;DR: The fine structure of conidia of the fungus Metarrhizium anisopliae prior to and during germination on the integument of living elaterid larvae (wireworms; Coleoptera) is described and illustrated in this article.

TL;DR: Higher amounts of amino acids were found in the hemolymph of healthy female bees than in that of infected bees, an indication that the metabolic activites of Nosema -infected bees were less than those of healthy bees of the same age.

TL;DR: In this article, a strain of the entomophagous fungus Beauveria bassiana was cultivated under stationary and submersed conditions, and the presence of chitinase, cellulase, proteases, and lipase was ascertained.

TL;DR: When flagellates from cultures of T. rangeli that have decreased in virulence are introduced into the hemocoel of R. prolixus the salivary glands are not invaded regularly or, if invaded, the infection does not persist.

TL;DR: Activity of one selected isolate increased ∼80% after 5 serial passes through Heliothis zea and remained unchanged during 11 additional passes and no change in activity was detected when another isolate was serially passed seven times.

TL;DR: In a study of the chemical nature of antibacterial substances in plants, a simplified qualitative analytical method was developed and it was found that expressed juice from pitch pine foliage inhibited the growth in vitro of all entomogenous bacteria that were tested.

TL;DR: Results indicate that, in addition to the B. thuringiensis endotoxin, the spore may play an important role in killing the insect larva.

TL;DR: Suspensions of polyhedra of the Heliothis nuclear polyhedrosis virus were irradiated at 16 microwatts/cm2 with narrow-band ultraviolet energy at wavelengths of 257 nanometer (nm) and 364 nm and with broad-band energy in the visible and near-infrared range and assayed for virulence with 20-mg larval bollworms and tobacco budworms.

TL;DR: Three protozoan parasites and a fungal parasite have been found in Douglas fir beetles and the fungus Beauveria bassiana in adults causes a sporadic, nonspecific infection.

TL;DR: The possibility that the antibacterial substances in the coelomic fluids of marine invertebrates would be more likely to affect the common gram- negative, obligately marine bacteria than the rarely encountered gram-positive and terrestrial gram-negative forms is discussed.