effects of plant diversity and time of colonization on an herbivore-plant interaction.experimental field plantings showed that plant diversity strongly affected the population dynamics of a specialist herbivore, the striped cucumber beetle, acalymma vittata (fab.) (coleoptera: chrysomelidae). population densities over time were characterized by two peaks in numbers (from colonization and reproduction, respectively) and were consistently higher in cucumber monocultures (cucumis sativus l.) than in polycultures of cucumbers, corn (zea mays l.), and broccoli (brassica oleracea l.). ...197928310287
dynamics of short- and long-term association between a bacterial plant pathogen and its arthropod vector.the dynamics of association between pathogens and vectors can strongly influence epidemiology. it has been proposed that wilt disease epidemics in cucurbit populations are sustained by persistent colonization of beetle vectors (acalymma vittatum) by the bacterial phytopathogen erwinia tracheiphila. we developed a qpcr method to quantify e. tracheiphila in whole beetles and frass and used it to assess pathogen acquisition and retention following variable exposure to infected plants. we found that ...201424561664
using trap crops for control of acalymma vittatum (coleoptera: chrysomelidae) reduces insecticide use in butternut squash.striped cucumber beetle, acalymma vittatum f., is the primary insect pest of cucurbit crops in the northeastern united states. adult beetles colonize squash crops from field borders, causing feeding damage at the seedling stage and transmitting bacterial wilt erwinia tracheiphila hauben et al. 1999. conventional control methods rely on insecticide applications to the entire field, but surrounding main crops with a more attractive perimeter could reduce reliance on insecticides. a. cittatum shows ...200919610425
insect frass as a pathway for transmission of bacterial wilt of cucurbits.insects that vector diseases of plants are of critical concern to agriculture, but relationships between the vectors and pathogens often are poorly understood. in this study, we present research on vector relationships between the striped cucumber beetle, acalymma vittatum (f.) (coleoptera: chrysomelidae), and the pathogen that causes bacterial wilt of cucurbits, erwinia tracheiphila (smith) (enterobacteriales: enterobacteriaceae). we studied how the bacteria were retained in the gut of the beet ...200919389288
floral transmission of erwinia tracheiphila by cucumber beetles in a wild cucurbita pepo.cucumber beetles, acalymma vittatum (f.) and diabrotica undecipunctata howardi (barber), are specialist herbivores of cucurbits and the vector of erwinia tracheiphila (e.f. smith) holland, the causative agent of wilt disease. cucumber beetles transmit e. tracheiphila when infected frass falls onto leaf wounds at the site of beetle feeding. we show that e. tracheiphila also can be transmitted via the floral nectaries of cucurbita pepo ssp. texana l. andres (texas gourd). under field conditions, w ...201020146850
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