Development and reproduction of Spodoptera frugiperda on three pasture grasses
Author of the article:JIN Yin-Li1** MA Quan-Chao1 YANG Guang1 ZHOU Zhou1 HUANG Jian-Rong2 LI Guo-Ping2*** FENG Hong
Author's Workplace：1. Xinyang Agriculture and Forestry University, Xinyang 464000, China; 2. Key Laboratory of Integrated Pest Management on Crops in Southern Part of Northern China, Ministry of Agriculture and Rural Affairs, Henan Key Laboratory of Crop Pest Control, Institute of Plant Protection, Henan Academy of Agricultural Sciences, Zhengzhou 450002, China
Key Words： Spodoptera frugiperda; pasture grasses; developmental duration; survial rate; reproduction
Abstract：
[Aim]
To determine the suitability of three pasture grasses, Zea mexicana, Sorghum bicolor × So.
sudanense and Pennisetum
alopecuroides, as host plants for Sp.
frugiperda, and thereby
contribute to the development of effective control strategies for this pest. [Methods] Sp.
frugiperda were randomly assigned to one of three treatment groups, which
were each fed the leaves of one of the three grasses at a constant temperature
of 27 ℃. The
developmental duration of different life stages, the survival rate, pupal
weight, pupation rate, eclosion rate, fecundity (eggs laid per female), and
life table parameters, of each treatment group were then systematically
measured and compared. [Results] There was a significant difference (P < 0.05) in the duration of the larval periods of Sp. frugiperda that fed on Z.
mexicana, So. bicolor × So. sudanense, and P. alopecuroides (13.27, 14.33, and 15.04 d, respectively). The pupal weight of
female Sp. frugiperda fed on Z. mexicana (165.40 mg) was
significantly higher than that of those fed on So. bicolor × So. sudanense or P. alopecuroides (P <
0.05). There was a significant difference (P < 0.05) in the fecundity
of Sp. frugiperda fed on Z. mexicana, So. bicolor × So. sudanense, and P. alopecuroides (487.09, 329.15, and 184.47 eggs,
respectively). No significant difference were found in the larval survival
rate, pupation rate, or eclosion rate between Sp. frugiperda that fed on Z. mexicana and those that fed on So. bicolor × So. sudanense (P >
0.05), but there was a significant difference compared to those that fed on P. alopecuroides (P < 0.05). The host suitability indices of Sp. frugiperda for each of the three grass types were 12.33 (Z. mexicana), 7.76 (So. bicolor × So. sudanense),
and 6.03 (P. alopecuroides).
Comparison of life table parameters indicated that the net reproductive rates (R0)
of S. frugiperda that fed on Z. mexicana, So. bicolor × So. sudanense,
and P. alopecuroides were 217.32,
144.85, and 59.17, respectively. [Conclusion] Sp.
frugiperda is able to complete its life cycle and reproduce on all three
grass types tested. Among these, Z.
mexicana has the highest host
suitability, followed by So.
bicolor × So. sudanense, whereas P. alopecuroides is the
least suitable. Therefore, where crops such as maize are intercropped
with pasture grasses, it is crucial to implement early preventive measures to
reduce the risk of Sp. frugiperda damaging these.