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Summary of Small Fruit Pesticide Changes

Posted: January 17, 2011

Changes noted below are ones that have occurred since late fall 2009, when the 2010 Mid-Atlantic Berry Guide went to print. Note that not all formulations of each active ingredient are listed. If anyone knows of any changes involving other active ingredients that I've missed (that don't already appear in the Mid-Atlantic Berry Guide), let me know.

Kathy Demchak, Department of Horticulture, Penn State University

General
On some labels, we now see the mention of the low-growing berry subgroup (Group 13-07G), which includes lowbush blueberry and cranberry. The use of this grouping allows materials to be used on crops that previously rarely appeared on pesticide labels.

Subtraction
Endosulfan (trade name Thionex, and formerly Thiodan) use is being terminated due to concerns about worker safety and endosulfan's ability to accumulate in the food chain. Endosulfan is classified as restricted use, and re-entry intervals are already quite long (five days for strawberries and nine days for blueberries), so uses were already somewhat limited. However, one gap in pest control may be in materials available for cyclamen mite control on strawberries, for which endosulfan could be applied at renovation or early in the spring, but Portal (listed below) should help to fill the gap. Existing stocks can still be used.

Additions
Portal® (fenpyroximate, Nichino America, Inc.) is labeled for use on the low-growing berry subgroup, which include strawberries. Target species are mites including two-spotted spider mites, and though use rates for cyclamen mites do not appear on the full label, they appear on a 2(ee) recommendation. The label does not allow use of adjuvants, and cyclamen mites can be difficult to reach since they are in the crown of the plant. So, high water volume is recommended when this material is applied for cyclamen mites at recommended timings (early spring or renovation when the crown area is accessible). Use of this product is limited to two applications per season at least 14 days apart to avoid resistance development.  Fenpyroximate is in IRAC activity group 21A, which is different from other activity groups labeled on strawberries. The pre-harvest interval (PHI) is one day, and the re-entry interval (REI) is 12 hours. 

Altacor® (chlorantraniliprole, aka rynaxypry®, Dupont) is labeled for use on caneberries  (raspberries, blackberries, etc.) for the target pests omnivorous leafroller (not a problem in Pennsylvania) and raspberry crown borer (adults), which can be a problem here, most frequently on blackberries. The PHI is three days, and the REI is four hours. 

Danitol® 2.4EC (fenpropathrin, Valent) is labeled for use on caneberries, (besides strawberries and blueberries on which it had already been labeled) with the most utility against Japanese beetle. It is also labeled for use for two-spotted spider mites, but the use of broad spectrum insecticides such as pyrethroids (part of the pesticide group into which fenpropathrin falls) is tough on beneficial mites, and thus has often resulted in pest mite flare-ups. The PHI is three days, and the REI is 24 hours.