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Journal of Tea Science ›› 2022, Vol. 42 ›› Issue (6): 828-838.doi: 10.13305/j.cnki.jts.2022.06.008

• Research Paper • Previous Articles     Next Articles

Development and Reproduction of Ectropis grisescens and Ectropis obliqua Based on the Two-Sex Life Table

GE Fanxing1,2,3, SHI Fan2,3, CHENG Chunxi2,3,4, CHEN Lilin2,3,*   

  1. 1. Anxi Tea College, Fujian Agriculture and Forestry University, Anxi 362406, China;
    2. State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou 350002, China;
    3. Institute of China White Tea, Fuding 355200, China;
    4. College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China
  • Received:2022-01-07 Revised:2022-04-19 Online:2022-12-15 Published:2023-01-04

Abstract: Ectropis grisescens Warren and Ectropis obliqua Prout are two serious defoliators in tea gardens, which affect both yield and quality of tea. In the study, using the age-stage two-sex life table, the growth and development indices, age-stage-specific survival rate, age-stage-specific fecundity, age-stage-specific life expectancy, age-stage-specific reproductive value, and population parameters of tea geometrid were measured and the differences of the parameters were analyzed. The results show that the developmental duration of the 1st, 2nd, 4th, and 5th instar larvae, the total duration of larvae, the pupal stage, and the adult longevity of E. grisescens (3.22, 2.55, 1.43, 4.56, 15.34, 7.98, and 7.59 d, respectively) were significantly lower than those of E. obliqua (4.07, 3.05, 2.16, 5.71, 18.83, 8.88, and 10.65 d, respectively). The survival rates of the 2nd to 5th instars larvae of E. grisescens were 100.00%, 95.00%, 62.00% and 96.00%, respectively, which were significantly higher than those of E. obliqua (93.00%, 71.00%, 45.00% and 80.00%, respectively). The mean generation duration of E. grisescens was 32.412 d, which was significantly shorter than that of E. obliqua (36.016 d). The age-stage-specific survival rate and intrinsic rate of increase of E. grisescens were higher than those of E. obliqua, and the mean generation duration was shorter than that of E. obliqua. The population of E. grisescens could expand more rapidly. The results provided basic data for the lab population rearing of E. grisescens and E. obliqua, and provided theoretical basis for the competition mechanism and the selection of population control strategies of the two sibling species.

Key words: Ectropis grisescens, Ectropis obliqua, age-stage two-sex life table, survival rate, fecundity

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