New Plant Protection Products for Berries
Posted: March 28, 2011
Kathy Demchak, Small Fruit Horticulturist, Department of Horticulture
Coragen from Dupont Crop Protection (chlorantraniliprole, aka Rynaxypyr®) is labeled for use on strawberries. Coragen has the same active ingredient as Altacor, but strawberries appear on the Coragen label, and caneberries appear on the Altacor label. A useful addition is control of Japanese beetle adults which appear on very few labels for strawberries. When Japanese beetle populations are high, adults will feed on the foliage of June-bearing strawberries as they re-grow after renovation, and they can be very problematic on day-neutral strawberries where they will even burrow into the fruit that is produced during the summer and early fall. Several other pests that appear on the label are not normally problems on strawberries in Pennsylvania. The pre-harvest interval (PHI) is 1 day, and the re-entry interval (REI) is 4 hours.
Rimon from Chemtura Corp. (novaluron) is labeled for use on low-growing berries including strawberries and bushberries (highbush blueberries, gooseberries, etc.). Many pests appear on the label, but especially problematic ones are tarnished plant bugs and sap beetles on strawberries, and cranberry fruitworm and blueberry maggot on blueberries. The PHI is 1 day for strawberries and 8 days for bushberries. The REI is 12 hours.
Ph-D from Arysta LifeScience (polyoxin-D zinc salt) is labeled for use on strawberries. Anthracnose, botrytis (gray mold), and powdery mildew appear on the label. This is a neat addition in that the active ingredient is thought to be very safe, and it has a 0-day PHI and 4-hour REI. It has provided good control of gray mold on other crops.
Courier from Nichino America, Inc. (buprofezin) is a growth regulator labeled for use against whiteflies on strawberries. It has a 3-day PHI and a 12-hour REI. In Pennsylvania, whiteflies are not normally a problem on strawberries in the field, but they often are in protected culture, such as high tunnel production.
Some interesting mixes of active ingredients are becoming available. Hero is a mixture of zeta-cypermethrin (the active ingredient in Mustang Max) and bifenthrin (the active ingredient in Brigade). It is labeled for many common pests on blueberries with a 1-day PHI, and for crown borer adults on caneberries with a 3-day PHI. The REI is 12 hours. Athena is a mixture of bifenthrin (the active ingredient in Brigade) and avermectin B1 (a relative of the active ingredient in Agri-Mek miticide). Almost every mite and insect pest we have in Pennsylvania strawberries is on the label, which could tempt growers to use this one product repeatedly. However, resistance development is always a concern, especially for insects or mites that have multiple generations in one growing season. Remember to rotate with products that have active ingredients with different modes of action. The PHI for Athena is 3 days, and the REI is 12 hours.