The bumblebees, a group of bees with more than 250 species worldwide, are one of the three groups of bees which show a well-developed social behavior. They are present in most of the bio geographical regions of the world, but the Ethiopian, Australian, and Oceanic. The group is especially diverse in the Paleartic and Oriental regions, and is well represented in the new world, especially in the Western Neartic and Western Neotropical regions. The group was recently organized in 15 subgenera, three of them with species in the neotropics.
The invasiveness of the polyphagous glassy-winged sharpshooter (Homalodisca vitripennis (Germar), GWSS) using the PBDM approach. GWSS is indigenous to the southeastern United States and northeastern Mexico, and extended its range into California USA in 1989. GWSS is a vector of the pathogenic bacterium, Xylella fastidiosa (Wells et al. 1987), which causes Pierce’s disease (PD) in … Continue reading Grape Agro-ecosystem Analysis-Glassy winged sharpshooter
The invasive weed yellow starthistle (YST) (Centaurea solstitialis) and its interactions with annual grasses and herbivorous biological control agents is used to demonstrate the utility of the PBDM approach for analyzing complex invasive species problems. The PBDM model accurately predicts the distribution and relative abundance of YST across the western USA, and the results are … Continue reading Analysis of the Biological Control of Noxious Weeds: Yellow starthistle
Models for cassava (Manihot esculenta Crantz) growth, development and yields as modified by weather, soil water and nitrogen, and natural enemies were developed. Rainfall-induced mortality and plant carbohydrate stress were the major determinants of P. manihoti population patterns prior to the introduction of exotic natural enemies. The cassava model was the basis for examining the … Continue reading Analysis of the Biological Control of Cassava Pests In SubSaharan Africa (with IITA Nigeria)