Author of the article:
Author's Workplace:
Key Words:biodiversity, organic paddy, parasitic enemies, pests
Abstract:The movement of natural enemies into organic rice fields beside a ridge on which soybean and maize were planted was compared to that into a control rice field with no soybean or maize crops nearby. We found that significantly more natural enemies moved into rice fields from soybean than from maize habitat. Parasitism rates of the eggs of Chilo suppressalis, Tryporyza incertulas, Cnaphalocrocis medinalis cnienee, and Nilaparvata lugens in the organic rice field adjacent to soybeans were 178%, 203%, 102%and 124%, respectively, which were 43%,75%,21%and 34%higher than those observed in the control. Parasitism rates on eggs of the four pests in the organic rice field adjacent to maize were 103%, 44%, 86%and 93%, respectively, which were 32%, 16%, 05%and 03%lower than in the control. The rates of occurrence of larvae or nymphs of the four pests in rice adjacent to maize were 103%, 194%, 175%and 26%, respectively, which were differences of +09%, -25%, +19%and -19%respectively, compared with the control. These results provide important information for the biological control of crop pests.