In summary, SWD is clearly one of the most devastating pests in the history of Georgia blueberry production. It is therefore extremely important for growers to implementing management strategies in a proactive manner in order to minimize the impact of this pest. Following are the key components of effective management of SWD:
- Monitor fields with traps and check the traps weekly starting from the fruit-set until the end of harvest.
- Make sure to check the trapped flies and correctly identify SWD to determine presence and number of male and female SWD.
- Once SWD is detected in the traps while the berries are ripening or ripe, apply effective insecticides registered for blueberries to protect the fruit. For detailed information about insecticides for SWD in blueberries (see Table 1 and Table 2, and also other resources available locally http://www.ent.uga.edu/labels/BlueberryInsecticide.pdf and regionally http://www.smallfruits.org/SmallFruitsRegGuide/Guides/2014/BlueberrySprayGuide11252013.pdf).
- Make sure to rotate classes of insecticides to delay the development of insecticide resistance.
- Continue monitoring to evaluate your management program, and respond in a timely manner if needed.
- If possible, harvest frequently and remove leftover fruit from the orchard to reduce fly feeding and breeding resources.
- Keep yourself updated about this pest to informed decisions to manage it. Find the latest information at our UGA Blueberry Blog (http://blog.caes.uga.edu/blueberry/) and sign up to receive updates instantly.
|Table 1. Registered Insecticides for Spotted Wing Drosophila Management|
|Trade Name||Chemical Name||Class||Application Rate (per acre)||Pre-Harvest Interval (days)||Re-Entry Interval (hours)||MRL* U.S.||MRL* Canada||SWD Activity|
|Malathion 8F||Malathion||Organophosphates||2.5 pint||1||12||8||8||E|
|Imidan 70WP||Phosmet||Organophosphates||1.33 lb||3||24||10||5||E|
|Mustang Max 0.8EC||Zeta-cypermethrin||Pyrethroid||4 oz||1||12||0.8||0.1a||E|
|Danitol 2.4EC||Fenpropathrin||Pyrethroid||16 oz||3||24||3||3||E|
|Asana XL||Esfenvalerate||Pyrethroid||9.6 oz||14||12||1||0.1a||E|
|Brigade 10WSB||Bifenthrin||Pyrethroid||16 oz||1||12||1.8||0.1a||E|
|Hero 2.1EC#||Bifenthrin + Zeta-cypermethrin||Pyrethroid||6-10.3 oz||1||12||1.8, 0.8||0.1a,0.1a||E|
|Pyganic 1.4EC||Pyrethrin||Pyrethrin||64 oz||0.5||12||1||1||F|
|Entrust 80WP||Spinosad||Spinosyn||2 oz||3||4||0.25||0.5||G|
|Delegate 25WG||Spinetoram||Spinosyn||6 oz||3||4||0.25||0.5||E|
|Assail 30SG||Acetamiprid||Neonicotinoid||5.3 oz||3||1.6||1.6||G|
|Exirel||Cyantraniliprole||Anthranilic Diamide||13.5-20.5 oz||3||12||4||4||E|
- * The maximum residue limit is provided for U.S. and Canada. Check http://www.mrldatabase.com for MRLs in other countries.
- a No MRL set, so default MRL is shown. Check with your marketers on their export policy.
- # Hero is a mixture of bifenthrin and zeta-cypermethrin (ingredients in Brigade or Bifenture and Mustang Max). Carefully check the rates used of these products so you do not exceed the total seasonal limit for both active ingredients.
|Table 2. Suggested insecticide rotational programs for Spotted Wing Drosophila Management in Georgia Blueberries|
|Management Strategy||Weekly rotations|
|Export-friendly, maximum modes of action||Imidan (phosmet), Malathion 8F, Delegate (spinetoram), and Danitol (fenpropathrin)|
|Short pre-harvest interval (PHI)||Mustang Max (zeta-cypermethrin) and Malathion 8F|
|Reduced risk||Delegate and Exirel (cyantraniliprole)|
|Organic production||Entrust and Pyganic|