Agriculture, Pêche et Aquaculture
 
Department of Agriculture, Aquaculture and Fisheries
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  Cranberry Insect Pest Monitoring 2001




C.M. Maund1 and Julie Baker1


Abstract: Insect pests were monitored at two cranberry (Vaccinium macrocarpon) sites, Maugerville (Sunbury County) and Sainte-Anne-de-Kent (Kent county), in New Brunswick during 2001. The Maugerville site was monitored to determine when control measures would be required in a site of first-year commercial harvest. Monitoring was done in the Ben Lear cultivar. The Sainte-Anne-de-Kent site was monitored to determine when control measures would be required in a more northern and coastal area. Monitoring was done in the Stevens cultivar. Pheromone traps were used to monitor the following moths: blackheaded fireworm, Rhopobota naevana (Hübner); cranberry girdler, Chrysoteuchia topiaria (Zeller); sparganothis fruitworm, Sparganothis sulfureana (Clemens); cranberry fruitworm, Acrobasis vaccinii Riley. Results from Maugerville: blackheaded fireworm, trapped from 20 June to 14 August. (The Maugerville site had much higher levels of blackheaded fireworm moths trapped, compared to the Sainte-Anne-de-Kent site.) Cranberry girdler, trapped from 20 June to 14 August; cranberry fruitworm, trapped from 10 to 25 July; sparganothis fruitworm, trapped on 10 July. Results from trap captures provided information for timing of insecticide applications. Plants were sampled to determine the 50% out of bloom stage, which occurred on 6 July. This date was used for determining the appropriate time to apply a control measure for the cranberry fruitworm. A pre-harvest assessment, of four hundred cranberries, on 20 September revealed 98.8% were undamaged. Four point five percent of berries had red speckles before they ripened but the speckles would have become less or not apparent as berries reddened and, therefore, were considered undamaged. The cause of the speckling was unknown, but the speckles were similar in appearance to damage caused by the disease berry speckle, Gibbera myrtilli (Cooke). No berries were damaged from fruitworm insects; 1.2% were damaged from unknown causes (including physical damage). Results from Sainte-Anne de-Kent: blackheaded fireworm, trapped from 4 to 18 July; cranberry girdler, trapped from 20 June to 31 July; cranberry fruitworm, trapped from 18 July to 14 August. (The Sainte-Anne-de-Kent site had much higher levels of cranberry fruitworm moths trapped, compared to the Maugerville site.) Sparganothis fruitworm - none trapped. The 50% out of bloom stage occurred on 14 July. A pre-harvest assessment, of four hundred cranberries, revealed 99.8% were undamaged. Eleven point three percent of berries had red speckles before they ripened but the speckles would have become less or not apparent as the berries reddened and were, therefore, considered undamaged. The cause of the speckling was, similarly, unknown. No berries were damaged from fruitworm insects; 0.2% were damaged from unknown causes (including physical damage). Visual field inspections at both sites revealed no obvious signs of plant damage from other cranberry insect pests. The cranberry tipworm, Dasyneura vaccinii (Smith), was not present in samples at both sites.




1NB Department of Agriculture, Fisheries and Aquaculture, Agriculture Development Branch, P.O. Box 6000, Fredericton, NB, E3B 5H1

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