Study on the damage of <i>Spodoptera frugiperda</i> to ears of different maize cultivars

LI Xianjia; WU Jiyingzi; DAI Xiuchun; WANG Yongqing; WANG Ruifei; ZHANG Zhixiang; XU Hanhong

doi:10.7671/j.issn.1001-411X.202006031

Journal of South China Agricultural University > 2021 > 42(2): 71-79. > DOI: 10.7671/j.issn.1001-411X.202006031

LI Xianjia, WU Jiyingzi, DAI Xiuchun, et al. Study on the damage of Spodoptera frugiperda to ears of different maize cultivars[J]. Journal of South China Agricultural University, 2021, 42(2): 71-79. DOI: 10.7671/j.issn.1001-411X.202006031

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Study on the damage of Spodoptera frugiperda to ears of different maize cultivars

1.
College of Agriculture/Key Laboratory of Natural Pesticides and Chemical Biology, Ministry of Education, South China Agricultural University, Guangzhou 510642, China
2.
Guangzhou Academy of Agricultural Sciences, Guangzhou, 510308, China

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Received Date: June 15, 2020
Available Online: May 17, 2023

Graphical Abstract

Abstract

Abstract

Objective
To investigate the damage of Spodoptera frugiperda to ears of 22 maize cultivars widely planted in Guangdong Province.

Method
The damage of corn ear was investigated by “Z” shaped five-point sampling method. The damage of the upper and lower corn ears of each plant, including the numbers of 1st to 3rd instar larvae, 4th to 6th instar larvae, live insects, live pupae and the damage position drilled by larvae were recorded.

Result
Twenty-two maize cultivars were all damaged seriously by S. frugiperda and the ratios of damaged plants were higher than 25% for all cultivars, while there were significant differences in damage degree among different cultivars. The sweet corns suffered the most serious damage compared to other cultivars, especially the ratio of damaged plants of ‘Yuetian 16’ was up to 99.67%. There was no significant difference in damage between the upper and lower corn ears for each cultivar except ‘Yuenong 19’ and ‘Guangcainuo 19’. Majority of corn ears had S. frugiperda larvae and the ratio of corn ear containing 1 and 2 larvae was 26% − 85%, the ratio of corn ear containing 3 larvae was 2% − 17%, while no corn ear was found to have more than 3 larvae. The number of 4th to 6th instar larvae was higher than that of 1st to 3rd instar larvae for each cultivar except ‘Guangnuo 9’ and ‘Guangnuo 2005’. Ranging from 38% to 71% S. frugiperda larvae entered into corn ear from corn silk and pupated, and the average number of pupae per 100 plants were 9−32.

Conclusion
S. frugiperda prefer to eat sweet corn and waxy corn and pupate in their ears, while the damage to feed corn is relatively light. The 1st−3rd and 4th−6th instar larvae of S. frugiperda have the same feeding behavior during the milky stage of corn and they prefer to enter into corn ear from corn silk and damage corn. The results can provide references for breeding resistant corn cultivars and precise control of S. frugiperda.
- Spodoptera frugiperda,
- corn cultivar,
- ear,
- feeding behavior

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References (28)

References

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