Grey Tortrix Moth

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Grey Tortrix Moth PPeesstt AAlleerrtt GGrreeyy TToorrttrriixx MMootthh Grey tortrix (Cnephasia stephensiana) Identification caterpillars caused damage to alfalfa in the Williams Lake and Kersley regions of B.C. in Adults: Adults are greyish-white moths, about 2009, 2010 and 2011. Since 2011, damage by 18 - 22 mm wing span (Figure 1). this pest has been reported in Lumby, Larvae: Larvae vary in colour from yellowish Sparwood, Creston and Fort Fraser. Farmers are to brownish black (Figure 2). asked to report any suspect damage in new regions to the B.C. Ministry of Agriculture Life Cycle offices or contacts below: The life cycle in B.C. is not known but larvae are present by mid-June. In Japan and Europe, • Susanna Acheampong, Ministry of Cnephasia species are known to overwinter as Agriculture, Telephone: (250) 861-7681, young larvae in silken cocoons. The young Email: [email protected]) larvae feed from April to June, pupation occurs in June and July, and moths fly in July and • AgriService BC, Telephone: 1 888 221-7141 August. Email: [email protected] Figure 1. Adult Cnephasia stephensiana Figure 2. Left, young larva; Right, mature larva Damage On alfalfa, larvae feed by mining leaves and later live in spun or folded leaves (Figure 3). Hosts Hosts include alfalfa, legumes and weeds such as lambs quarters, hogweed, thistle, broad leaf plantain, dock, sorrel, dandelion and clover. In B.C., damage has been reported on alfalfa, cow parsnip, rhodiola, dandelion, clover, hogweed and pea vine. Control There are currently no registered chemical control products in Canada for this pest. Bacillus thuringiensis and Sevin (carbaryl) used for the control of other caterpillars in alfalfa will provide control. It is also recommended that infested fields be cut early before caterpillars have caused significant damage. A parasitic wasp, Scambus canadensis has been reared from caterpillars and may play a role in controlling Figure 3. Cnephasia stephensiana feeding damage this pest. to alfalfa leaves Acknowledgement We would like to thank Dr. Jean-Francois Landry of Agriculture and Agri-Food Canada, Insect Identification Service, Ottawa for the identification of moths. Susanna Acheampong PhD Ministry of Agriculture 1690 Powick Road Kelowna, BC V1X 7G5 Phone: 250 861-7681 Email: [email protected] August, 2018 .
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