Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Insect phytophagous and predators incidence on maize and bean cultivated in exclusive and intercropped systems.

Abstract

An experiment was conducted in Minas Gerais, Brazil, in 1996-97 to investigate the occurrence of plant pests and predators in maize and beans (Phaseolus vulgaris) cultivated in exclusive and intercrop systems. One cultivation of maize and 2 cultivations of bean were made. The first bean cultivation was during the rainy period, while the second was during the drought period. Maize in intercropped systems were attacked by Dalbulus maidis and Spodoptera frugiperda, while bean was attacked by Diabrotica speciosa, Cerotoma arcuata and Empoasca kraemeri. The densities of Thrips tabaci and Pseudoplusia includens [Chrysodeixis includens] were higher in bean intercropped with maize. The total number of pests was higher in bean-maize intercropping during the rainy period than in sole bean cultivation. The predators found were Anthicus sp. and Formicidae. Formicidae was more abundant in sole maize and sole bean cultivations than in intercrop systems.