Research on the threshold effects of the intensity of pesticide use, crop biodiversity and the occurrence acreage of crop diseasesand insect pests
Journal Title: 广东农业科学 - Year 2018, Vol 45, Issue 9
Abstract
Based on provincial panel data of 30 provinces（cities and autonomous regions）from 2003 to 2013, this paper built two panel threshold models which took the intensity of pesticide use and crop biodiversity as threshold variables and analyzedthe threshold effect of the intensity of pesticide use and crop biodiversity on the occurrence acreage of crop diseases and insect pests. The results showed that the intensity of pesticide use could not only increase the occurrence acreage of crop diseases and insect pests, but also had a significant threshold effect on crop biodiversity. When the crop biodiversity was lower than the threshold value, an extra unit of the intensity of pesticide use would increase 0.8048 units of the occurrence acreage of crop diseases and insect pests; when the crop biodiversity was higher than the threshold value, the impact of the intensity of pesticide use on the occurrence acreage of crop diseases and insect pests would decrease to 0.66 times of its lower threshold value. Crop biodiversity had a significant threshold effect on the occurrence acreage of crop diseases and insect pests, and it was double thresholds: when the intensity of pesticide use was lower than the first threshold value, crop biodiversity had a significantly negative effect on the occurrence acreage of crop diseases and insect pests; when the intensity of pesticide use was between the first and the second threshold values, the effect of crop biodiversity on the occurrence acreage of crop diseases and insect pests was negative but not significant; when the intensity of pesticide use was higher than the second threshold value, the effect of crop biodiversity on the occurrence acreage of crop diseases and insect pests would be more significant than it was lower than the first threshold value. As a result, this paper put forward the following suggestions: controlling the intensity of pesticide use and strengthening the protection of crop biodiversity.
Authors and Affiliations
Wan NIE
Keywords
Related Articles
- EP ID EP602832
- DOI 10.16768/j.issn.1004-874X.2018.09.025
- Views 92
- Downloads 0
Research progress of Hydrangea breeding
"Hydrangea macrophylla is an important ornamental plant in developed countries. It can be used as potted plants，nursery stocks，cut flowers etc.，and plays a significant role in the market. There are more than 600 varie...
Effects of different fertilization treatments on soil microbial community in core-mining subsidence area
"To investigate the effects of fertilization treatments on soil quality of mine reclaimed land，this study evaluated the effects of different fertilization treatments on soil microbial community in core-mining subsidence...
Expression analysis of the MAPK genes in exogenous NO induced disease resistance to Penicillium digitatum in the postharvest citrus fruits
"Nitric oxide（ NO） is an important signal molecule involved in plant defense responses. It also induces the activation of the mitogen-activated protein kinase（ MAPK）. To study the expression of MAPK genes in exogenou...
The lethal effects of temperature treatment, carbon dioxide(CO2) enriched atmosphere and ethyl formate fumigation against Araecerus fasciculatus (De Geer)
This study examined the lethal effects of temperature treatment, carbon dioxide (CO2) enriched atmosphere and ethyl formate fumigation against larvae, pupa and adults of Araecerus fasciculatus (De Geer)under different tr...
The research on phenotypic traits genetic diversity of the ancient tea germplasm resources in Shaanxi province
"The research and utilization of the ancient tea germplasm resources were the new topic in the reasearch of the tea germplasm resources in China. In order to identify and evaluate the phenotypic traits diversity index of...