Effects of Temperature on the development,performance and fitness of the leafhopper "Dalbulus maidis" (DeLong) & Wolcott) (Hemipetra:Cicadellidae), a vector of maize pathogens

VAN NIEUWENHOVE, G; FRIAS, E.A; VIRLA, E.G

AGRICULTURAL AND FOREST ENTOMOLOGY

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2015

1461-9555

1 Maize and its wild teosinte (Zea) relatives are the only developmental hosts of the corn leafhopper. The leafhopper and the three phytopathogens that it transmits are found in a wide range of latitudes and elevations from the U.S.A. to Argentina.2 The vector?s populations would be expected to respond to environmental conditions. Temperature plays a key role in the life history of insects, limiting its geographical range.3 We focus on the effect of different constant temperatures on the development and fitness of Dalbulus maidis (DeLong) (Hemiptera: Cicadellidae) to estimate its thermal constant and threshold temperature, which may represent useful information for studies aiming to predict its potential distribution.4 Temperature had a significant influence on egg-laying and hatchability, as well as development and pre-imaginal survival of the vector, whereas the offspring sex ratiowas not influenced.5 Dalbulus maidis required 648.26 degree-days above a threshold of 4.9 ∘C to complete a life cycle; it had a wide oviposition range (15?40 ∘C), although its fitness occurred in a narrower range (17.5?35 ∘C). Apparently, the distribution range of D. maidis could be restricted by host plant availability more than by temperature.6 The vector is unlikely to develop permanent populations in temperate areas of the American continent because there is no availability of host plants for extended periods, with mean temperatures below 17 ∘C.