Journal of Economic Entomology (2014) 107, 897-905

Shu-Jen Tuan, Nian-Jhen Li, Chih-Chun Yeh, Li-Cheng Tang and Hsin Chi (2014)
Effects of green manure cover crops on Spodoptera litura (Lepidoptera: Noctuidae) populations
Journal of Economic Entomology 107 (3), 897-905
Abstract: Spodoptera litura (F.) is an important pest of numerous agro-economic crops, including green manure cover crops. In Taiwan, sesbania (Sesbania roxburghii Merr.), sunn hemp (Crotalaria juncea L.), and rapeseed (Brassicae campestris L. variety chinensis) are the most popular green manure crops; sesbania and sunn hemp are commonly planted in warm seasons, whereas rapeseed is grown in the winter. In this study, life-table data for S. litura reared on these three green manures were collected to evaluate their roles as refuges of this pest. The net reproductive rate, intrinsic rate of increase, and finite rate of increase of S. litura were the highest when reared on sesbania (1428.1 offspring, 0.2327 d^-1, 1.2621 d^-1), followed by sunn hemp (778.4 offspring, 0.2070 d^-1, 1.2300 d^-1) and rapeseed (737.6 offspring, 0.2040 d^-1, 1.2263 d^-1). The high growth rates on these green manure crops show that they can serve as potential breeding sites for S. litura. Population projection demonstrated the rapid growth of S. litura on sesbania, sunn hemp, and rapeseed as well. Because most growers have traditionally ignored pest management in green manure fields, the mass emergence of S. litura in these fields may cause unexpected infestations in nearby vegetable, corn, and peanut crops. This study shows that the use of green manures as sources of nutrients should be critically reassessed and an area-wide pest management program should be instituted by taking the population of S. litura in green manure fields into consideration.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Full text of article
Database assignments for author(s): Hsin Chi

Research topic(s) for pests/diseases/weeds:
environment - cropping system/rotation

---

Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Spodoptera litura	Brassica - other species	Taiwan
	Spodoptera litura	Taro (Colocasia)	Taiwan
	Spodoptera litura	Crotalaria (crop)	Taiwan
	Spodoptera litura	Sesbania (crop)	Taiwan