SWD Host List Risk? NE SWD Working Group
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1 Spotted wing drosophila monitoring and management in caneberries and eastern vineyards Douglas G. Pfeiffer Dept. of Entomology Virginia Tech, Blacksburg Spotted wing drosophila, Drosophila suzukii (Matsumura), in Virginia October 2013 NE SWD Working Group SWD Host List Risk? Raspberries, blackberries, strawberries blueberries Cherries, grapes Nectarines, es, peaches, es, plums Apple, pear Tomatoes? Drosophila suzukii Suitability of grape? Cherry Grape Emerge to Ovip. (days) Body length, Female 2.5 mm 4.0 mm Kanzawa 1939, in Walsh et al In Japan, reported to be severe on grape
2 SWD Host List Grape? Drosophila suzukii Initial impressions in western states that grape not highly vulnerable Mainly seen where grapes are already split Impact on research in the east? What is the situation in eastern wine grape regions? Drosophila suzukii Drosophila suzukii SWD Infestation Amherst VA SWD Infestation Crozet VA 2012 Cultivar Larvae / Berry Petit Verdot a Pinot Larvae / Berry Pinot 0.03a Chardonnay 0.00b Petit Verdot b Merlot 0.02b Chardonnay 0.01b Cabernet Franc 0.00b Means followed by the same letter are not significantly different (Tukey s HSD, P=0.018) Means followed by the same letter are not significantly different (Tukey s HSD, P=0.001)
3 Potential Reasons for Regional SWD preferred temperature range Preferred temperature of SWD C Decrease of activity, oviposition, longevity above 30 C (average lethal limit, LT50) Average summer temps: Napa 30.3 Virginia 22.9 Pennsylvania 22.8 New York 19.2 Willamette Valley 18.2 (RH?) Potential range of SWD, based on temperature thresholds Potential Reasons for Regional Martin Damus, Canadian Food Inspection Agency Potential Reasons for Regional Potential Reasons for Regional
4 Potential Reasons for Regional SWD Host List Non-crop hosts Wild blackberries Pokeweed Mock strawberry Asian honeysuckle Dogwood Persimmon Rose hips Porcelain berry Trapping for SWD Apple cider vinegar sugar/yeast Burrack: SWD monitoring network hila adults SWD and other drosop Preliminary Results A AB B Alpha Scent B *SWD adults in blue *Other drosophila adults in red Preliminary Results Zaprionus indianus Gupta, African fig fly
5 AFF World Distribution AFF US Distribution African fig fly, Zaprionus indianus Gupta, in Virginia October 2013
6 Incidence in wine grapes Weak ovipositor Sometimes high incidence in grape berries In some Virginia clusters, 90% of emerging drosphilids were AFF Sweep net samples in Pennsylvania vineyards How do they get into grapes? Competition stuey of Gilpin et al. (1986) Paired rearing comparisons of 28 drosophilid species, at two temps, two media 1 Zaprionus, 27 Drosophila spp. Gilpin et al. (1986) In thick food, carried out at 19 C, it was ranked 12 out of 28 in competitiveness In thick medium at 25 C, it was ranked 8 But in thin food, it was ranked 5 at 25 C, and ranked 3 at 19 C. Gilpin et al. (1986) Crowd out other larvae Liquify substrate, drowning other larvae Geographical differences in range limits? Summer heat limiting SWD? Winter cold limiting AFF? Will AFF have to reinvade each year? Will it be a late season pest annually? Cultural Control Harvest fruit promptly to eliminate breeding sites Destroy nearby overripe or rotten fruit Proper management of pomace
7 Need materials with short PHI Need materials of various MOA Need to rotate in a spray program! In high risk crops, need to spray weekly or more often Need local research on efficacy Organophosphates: Malathion effective in West; regional differences? Imidan effective but long REI (14 d) in grape (watch for developments here with new formulation) Spinosyns: Entrust (spinosad) effective but relatively short lived Delegate (spinetoram) very effective Pyrethroids among most effective materials Bifenthrin (Brigade, Bifenture) effective Danitol performs well Bifenthrin - PHI 30 days Danitol - PHI 21 days Mustang Max (zeta cypermethrin - PHI 1 day Baythroid (beta cyfluthrin) - PHI 3 days Pyrethroids Problems associated with use Most uses removed from PMG in recent years Time to reconsider? Kaolin (Surround) Problems associated with use - residues Use rates Harvest parameters?
8 Effective, less-disruptive chemistry under investigation Cyantraniliprole, related to chlorantraniliprole (Altacor), recommended for grape berry moth Commercial Vineyards After veraison: Entrust spinosad oz 7 d PHI Delegate spinetoram 3-5 oz 7 d PHI Malathion malathion 1.88 t 3 d PHI Mustang Max zeta-cypermethrin 2-4 fl oz 1 d PHI Pyganic pyrethrins 64 fl oz 0 d PHI Surround kaolin lb 0 d PHI Grandevo Chromobacterium 3 lb 0 d PHI Commercial Vineyards After veraison: Entrust spinosad oz 7 d PHI Delegate spinetoram 3-5 oz 7 d PHI Malathion malathion 1.88 t 3 d PHI Mustang Max zeta-cypermethrin 2-4 fl oz 1 d PHI Pyganic pyrethrins 64 fl oz 0 d PHI Surround kaolin lb 0 d PHI Grandevo Chromobacterium 3 lb 0 d PHI Commercial Vineyards After veraison: Entrust spinosad oz 7 d PHI Delegate spinetoram 3-5 oz 7 d PHI Malathion malathion 1.88 t 3 d PHI Mustang Max zeta-cypermethrin 2-4 fl oz 1 d PHI Pyganic pyrethrins 64 fl oz 0 d PHI Surround kaolin lb 0 d PHI Grandevo Chromobacterium 3 lb 0 d PHI Commercial Caneberry Preharvest sprays Entrust 80WP spinosad oz 1 d PHI Delegate 25WDG spinetoram fl oz 1 d PHI Malathion 8F malathion 2.0 pt 1 d PHI Mustang Max zeta cypermethrin 4.0 oz 1 d PHI Brigade 10WSB bifenthrin 16.0 oz 3 d PHI Asana esfenvalerate fl oz 7 d PHI Grandevo 30 Chromobacterium 2 lb 0 d PHI PyGanic 1.4EC pyrethrins 64 fl oz 0 d PHI Commercial Caneberry Preharvest sprays Entrust 80WP spinosad oz 1 d PHI Delegate 25WDG spinetoram fl oz 1 d PHI Malathion 8F malathion 2.0 pt 1 d PHI Mustang Max zeta cypermethrin 4.0 oz 1 d PHI Brigade 10WSB bifenthrin 16.0 oz 3 d PHI Asana esfenvalerate fl oz 7 d PHI Grandevo 30 Chromobacterium 2 lb 0 d PHI PyGanic 1.4EC pyrethrins 64 fl oz 0 d PHI
9 Commercial Caneberry Preharvest sprays Entrust 80WP spinosad oz 1 d PHI Delegate 25WDG spinetoram fl oz 1 d PHI Malathion 8F malathion 2.0 pt 1 d PHI Mustang Max zeta cypermethrin 4.0 oz 1 d PHI Brigade 10WSB bifenthrin 16.0 oz 3 d PHI Asana esfenvalerate fl oz 7 d PHI Grandevo 30 Chromobacterium 2 lb 0 d PHI PyGanic 1.4EC pyrethrins 64 fl oz 0 d PHI Questions? SWD.html
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