Showing papers in "Biological Control in 1994"

TL;DR: This study demonstrates that parasitoids use olfactory as well as visual learning to concentrate their search on the plant structures that are most profitable in terms of host encounters, and is the first account of multisensory conditioning and summational learning effects in insect parasitoid foraging.

TL;DR: A potential exists for the utilization of selected bacteria to control oak wilt through preinoculation and in vitro inhibition of the pathogen, Ceratocystis fagacearum.

TL;DR: Higher populations of natural enemies in mulch plots than in nonmulch plots probably accounted for the increase in yield by reducing Colorado potato beetle foliage feeding.

TL;DR: Ch Chrysoperla externa appears well suited as a biological control agent for use in pest management programs in tropical and temperate regions of Central and South America.

TL;DR: The presence of the naturally occurring microflora of apple wounds does not interfere with the biocontrol of storage rot by C. oleophila and, in some cases, may even be beneficial.

TL;DR: The degree of antifungal activity of the cell-free filtrates of the isolates of phase one was not significantly different from each other whereas that of phase two was significantly weaker.

TL;DR: The bioassay has the potential to be useful as a screening tool for determining pathogenicity of new fungal isolates and for the standardization and quality control of commercial fungal preparations for viability and virulence against insect pests before they are used far field applications.

TL;DR: It is suggested that augmentative releases of N. barkeri can be an ecologically sound alternative strategy for broad mite control in greenhouses and that it may also provide some control of the western flower thrips at the Same time.

TL;DR: Results from evaluations of five natural enemies of the silverleaf whitefly suggest that the probability of achieving successful augmentative biological central will be greater on poinsettia cultivars with fewer trichomes.

TL;DR: Grubs of the scarabaeid Cyclocephala hirta infected with the milky disease bacterium, Bacillus popilliae, were more susceptible to the entomopathogenic nematodes Heterorhabditis bacteriophora and Steinernema glaseri than healthy grubs.

TL;DR: The effects of guava ripening on abundance and parasitism rates of parasitoids of oriental fruit fly, Bactrocera dorsalis (Hendel), were determined in three guava orchards and modified sampling methods for population estimation and augmentative release studies are discussed.

TL;DR: An artificial diet may be an appropriate supplementary food for rearing C. rufilabris where labor costs are high and development of larvae was shortened with increased survivorship, adult emergence, and body weight.

TL;DR: The high degree of host specificity shown by this weevil species allowed its exportation in July 1992 to quarantine facilities in Florida for further evaluation, and its potential efficacy as a biological control agent is estimated using the Goeden-Harris scoring system.

TL;DR: The roles of host-finding ability by the nematode Steinernema carpocapsae and host nonself response (immunity) toward the nem atodes were determined to partially explain this low susceptibility of Leptinotarsa decemlineata to S. carpocapae.

TL;DR: Candida guilliermondii was evaluated for compatibility with commercial citrus coatings for application to heat-treated grapefruits (Citrus paradisi Macf.) and biological control of Penicillium digitatum.

TL;DR: An artificial substrate is useful in mass rearing of insects because the medium is available for use at any time of the year, and it reduces the likelihood of colony contamination by pathogens and pesticide residues.

TL;DR: The high susceptibility of the two most important acridid pests in Australia to a locally derived isolate encourages the development of M. flavoviride as a more environmentally benign alternative to fenitrothion spraying.

TL;DR: Both sexes of the predator showed a typical Type II functional response, with the Holling disk equation as an acceptable model, for all three prey species in both corn and noncorn situations.

TL;DR: A consistently high correlation between populations of C. maculata adults and H. postica larvae may reflect the ability of this predator to aggregate to an increasing weevil density, which helps to maintain C. Maculata populations in alfalfa fields when A. pisum populations are low.

TL;DR: Daily progeny production for the cohort-age interval 6-20 days was found to be optimum, and a discard age of 21 days is recommended, and Percentages of male parasitoid progeny declined significantly as the host puparial size increased.

TL;DR: Larvae of all species and adults of Scymnus frontalis and Propylea quatuordecimpunctata searched more for prey on rolled leaves than on open leaves, while search time inside rolled leaves was greater by S. frontalis adults than by other adults and greater than by Coccinella septempunctata and Hippodamia variegata.

TL;DR: Results suggest that the toxin at 100 mg/m 2 effectively controlled the cupreous chafer in the sweet potato fields.

TL;DR: Results of this study indicate that plant competition and biological control can be combined to suppress Canada thistle, and C. rubiginosa as well as induced competition can be an integral part of a comprehensive approach for area-wide CanadaThistle control.

TL;DR: Auxotrophic and nitrate nonutilizing mutants were used to characterize vegetative compatibility, heterokaryosis, and asexual gene exchange in the fungal biological control agent Colletotrichum gloeosporioides f.sp.

TL;DR: Certain phylloplane bacteria may enhance the efficacy of mycoherbicides by stimulating the formation of appressoria and reducing the saprophytic preinfection mycelial growth of the pathogen on the phyllplane.

TL;DR: The severe biological perturbations resulting from LdMNPV/Tinopal consumption are interpreted in light of current understanding of larval lepidopteran midgut physiology and no significant effects on hemolymph pH were detected with any treatment.

TL;DR: Pine bark powder decreased fungal growth in vitro and reduced disease incidence in greenhouse experiments while altering soil fungal populations, and increases in soil trehalase activity were correlated with increases in total populations of indigenous fungi and specifically with species of Penicillium and Paecilomyces.

TL;DR: The parasitoid complex of five species of the genus Pissodes was investigated at several sites in Europe and Eubazus spp.

TL;DR: A high density of tadpole shrimp was shown to have a significant negative impact on mosquito larvae (Culicidae) (P), and its hardy egg is the preferred stage for field distribution.

TL;DR: Biological control of the cassava mealybug (CM) in Zambia was successful and the frequency of ants increased with the CM population density.