An Integrated Cotton Insect Pest Management System for Cotton-wheat Intercropping in North China
Mar 13, 2017

Crop Protection WCRC Croprotection-Asia WCRC1
Abstract                                                                         Back to Table of contents

The north China cotton region is the largest cotton-producing area in China, with 3.5 million hectares grown to cotton annually, which constitutes 65% of the nation's total cotton land. Since the 1980s, there has been a rapid expansion of cotton-wheat intercropping, with the double cropped acreage increasing from 0.4 million hectares in 1978 to 2.3 million hectares in 1993, now accounting for 65% of the region's total cotton area. Because of this dramatic changes in the cropping systems, structures of insect communities and the dynamics of major insect populations have been altered. Thus, new control strategies and techniques must be developed.

During 1990-1993, structures of insect communities, fluctuations of major insect populations and control techniques in cotton-wheat intercropped areas, were studied. Based on these and previous studies, an integrated insect pest management (IPM) system for cotton-wheat intercropping in north China was developed. The IPM system comprised of four sub-systems; the technical, monitoring, decision-making and extension. The technical sub-system was the major component and consisted of a technical strategy and control techniques. The technical strategy was defined as "suppression of early and late season insect pests through bio-ecological regulating techniques and control of those at mid-season by rational application of insecticides". The control techniques for the early season were habitat modification, cultivation of early maturing cultivars and conservation of beneficials; those for the mid-season were trapping and chemical control; and those for the late season were application of plant growth regulators, removal of insect food sources and application of selective insecticides.

The IPM system was demonstrated and extended areawide in the major cotton producing provinces of Shandong and Henan during 1991-1993, which brought about significant economic, social and ecological benefits.

                                                                                      Back to Table of contents
Be the first to comment this