Interactions between Fusarium avenaceum and Hylastinus obscurus (Coleoptera: Scolytidae) and Their Influence on Root Decline in Red Clover
Authors: JIN, XIXUAN; MORTON, JOSEPH; BUTLER, LINDA
Source: Journal of Economic Entomology, Volume 85, Number 4, August 1992 , pp. 1340-1346(7)
Publisher: Entomological Society of America
Abstract:Fusarium avenaceum [(Corda ex Fries) Saccardol and clover root borer, Hylastinus obscuros (Marsham), have been implicated as causal agents in red clover (Trifolium pratense L.) root decline which may lead to stand deterioration within 2 yr. Fumigated and nonfumigated plots of red clover were established in a field pasture with or without added phosphorus (P) and with or without added inoculum of F. avenaceum. Clover root borer infestations occurred naturally in this field setting. F.avenaceum infection did not exceed 23% of feeder root segments sampled during the 1985 growing season, and about 90% of the root sites were asymptomatic. No fungal infection or root borer infestations were detected in tap roots. Fusarium infection remained unchanged in feeder roots during 1986. Root injury by H. obscuros was positively correlated (rZ = 0.978) with enlargement of tap roots. Larger tap roots, which clover root borer adults preferred for oviposition, were the direct results of improved soil P levels. The fact that tap root infection by F. avenaceum was restricted mostly to sites of root damage by H. obscuros indicated that clover root borers could be the vector of F. avenaceum inocula and predispose tap roots to Fusarium infection during ingress. Therefore, red clover root decline is caused primarily by root borer injury which occurs severely in fields where soil P levels are high, and red clover growth is accelerated. F.avenaceum is not highly virulent in natural field settings and is of secondary importance in red clover decline.
Document Type: Research Article
Publication date: August 1, 1992
- Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
- Editorial Board
- Submit a Paper
- Subscribe to this Title
- Information for Advertisers
- Visit this journal's homepage
- ingentaconnect is not responsible for the content or availability of external websites