Direct-observation studies were conducted in replicated experimental plots to identify causes and estimate rates of mortality of whiteflies in cotton over the course of six generations from late June through late October. In plots receiving no whitefly or Lygus insecticides, predation and dislodgment were major sources of egg and nymphal mortality, and overall survival from egg to adult ranged ...

Geminiviruses represent one of the major groups of phytopathogens of many economically important crops worldwide. In Trinidad, Potato yellow mosaic virusTrinidad isolate (PYMV-TT) has been implicated as the causal agent of disease epidemics in tomato since the late 1980s. Since its detection there has been an increase both in disease incidence and in geographical distribution among commercial t...