CONTENTS THE BUSINESS MAGAZINE FOR COMMERCIAL GROWERS FEBRUARY 2024 | VOLUME 34, NUMBER 2 6 On the Cover Snapdragon 'DoubleShot Peach' from Hem Genetics is a new, tall variety for beds and landscapes. Photo courtesy of Hem Genetics. 14 18 FEATURES 14 Plant Health Healthy crops Your guide to beating common diseases this season By Nancy Rechcigl 18 Production Understanding poinsettia heat delay Key strategies for growers to avoid heat delay By Ana Maria Borda, Paul Millar, Michael Alden and Jim Faust 22 2024 California Spring Trials CASTing into spring It's time to gear up for California Spring Trials 2024 By Heather Machovina 36 Lighting What's your lighting strategy? Experts discuss the benefit of having a lighting plan that encompasses more than spectrum By Heather Machovina 38 Pest Control It's all the buzz With wave of cicadas coming, research looks at feeding habits 40 Culture Report DoubleShot series The new, tall F1 snapdragon offers strong stems and open-faced flowers By Barry Ruta COLUMNS 6 Keeping fields cleaner By Joseph Faust 8 Dr. Bugs Stratiolaelaps scimitus By Raymond A. Cloyd Miss our January issue? 12 Technically Speaking LED lighting: A 2024 update By Erik Runkle It's now available to view on gpnmag.com GREENHOUSE PRODUCT NEWS 3 DEPARTMENTS 4 Editor's Report 44 Product Marketplace 48 Industry News/Events 50 Classifieds/Ad Index Perspectiveshttp://www.gpnmag.com