Acta Agriculturae Zhejiangensis ›› 2023, Vol. 35 ›› Issue (6): 1360-1367.DOI: 10.3969/j.issn.1004-1524.2023.06.13

• Plant Protection • Previous Articles     Next Articles

Influence of nectar plants in field ridge on diversity of natural enemy insects in paddy fields

ZHANG Lili1(), CHENG Jingwen2, LI Agen2,*(), YANG Yajun3,*()   

  1. 1. Hangzhou Centre of Agricultural Technology Extension, Hangzhou 310001, China
    2. Yuhang’s Management Station for the Agricultural Ecology and Plant Protection of Hangzhou, Hangzhou 311199, China
    3. Institute of Plant Protection and Microbiology, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
  • Received:2023-02-15 Online:2023-06-25 Published:2023-07-04

Abstract:

Planting nectar plants in field ridge is becoming a common green measure for preventing and controlling insect pests through improving the habitat in the field and the control effect of the agricultural ecosystem on pests. To further clarify the influence of nectar plants on the diversity of natural enemy insects in rice fields, this study investigated the insect species in paddy fields with ridges growing Sesamum indicum, Zinnia elegans Jacq., Cosmos sulphureus, and Cosmos bipinnatus, and analyzed their diversity and functional groups of natural enemy insects. In this study, 42 species of natural enemy insects were classified into 5 orders and 19 families, including 32 species of 10 families in Hymenoptera, 1 species of 1 family in Coleoptera, 4 species of 3 families in Diptera, 3 species of 3 families in Odonata and 2 species of 2 families in Hemiptera. The Chao1, Ace, Shannon and Simpson index of natural enemy insects did not differ in paddy fields with ridge growing different nectar plants, but the Chao1, Ace, and Simpson index of natural enemy insects were significantly higher in paddy fields with ridges growing nectar plants than those of the control. Furthermore, we analyzed the functional groups of natural enemy insects and found 13 species of predator insects (9 species of larval predators and 4 species of larval-egg predators), and 29 species of parasitic insects (17 species of larval parasites, 4 species of larval-pupal parasites, 3 species of pupal parasites and 5 species of egg parasites). The number of parasitic and predator natural enemy insects in paddy fields with ridges growing nectar plants was higher than those of the control. The numbers of partial parasitic natural enemy insects in paddy fields with ridges growing S. indicum and C. bipinnatus were higher than that of Z. elegans and C. sulphureus. Overall, ridges growing S. indicum, Z. elegans, C. sulphureus and C. bipinnatus facilitated the preservation of the diversity of natural enemy insects and promoted the population of natural enemy insects. Ridges growing S. indicum and C. bipinnatus are slightly more effective than the other two nectar plants, especially in maintaining some parasitic natural insect enemy groups.

Key words: nectar plant, field ridge, paddy field, natural enemy insect, diversity

CLC Number: