Spider Mites and Hops: A Survey for Ohio Hop Growers - 2016 Surveyor: Susan Ndiaye Graduate Assistant Department of Entomology The Ohio State University Dates: February/March 2016 Participants: Members of the Ohio Hop Growers Guild (~50 members) Attendees at the 2016 Ohio Hop Conference (~50 attendees) Method: Online Survey using Qualtrics Survey link: https://osu.az1.qualtrics.com/jfe/form/SV_emuTMQFStw88VJr?Q_JFE=qdg IRB approved How often do spider mites require management? Response # of responses Every Year 2 Sometimes 4 Rarely 2 Never 1 Location of Hop Yard # of responses Northwest Ohio 1 Northeast Ohio 1 Central Ohio 2 Southwest Ohio 3 Southeast Ohio 0 Out of State 0 Size of Hop Yard: # of plants # of row feet # of acres 10 0 20 80 40 0 400 1000 0.67 520 1650 0.50 600 0 1000 1.50 Treatments # of response Conventional Pesticides 4 Organic Pesticides 2 Biological Control by Conservation 3 Biological Control by Augmentation 1 Other 1 No Action 3 Conventail Pesticides # of responses Agri-Mek 0.7SC or 1.5EC (abamectin) 2 Oberon 2SC (spiromesifen) 1 Malathion 1 Zeal Miticide (etoxazole) 1 Organic Pessticides # of responses oil 2 Biological Control by Conservation # of responses alternative food source 2 habitat for natural enemies 3 pest specific insecticides 1 Biological Control by Augmentation # of responses Phytoseiulus persimilis 1 Neoseiulus californicus 1 Other Management Techniques # of responses forceful spray w/water when populations are spotted very early 1 Comments: • We need more reliable treatment for Japanese Beetles so we don’t run the risk of spider mite problems. • They come out of nowhere and invade very quickly. • I’ve only experienced anything that would be considered severe maybe 3 or 4 years out of the last 20 years. Those years were well above average for temperature and very below average for precipitation. • We need help in understanding how to control them.