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Ethylene Damage •Stunting •Epinasty •Flower abortion •Thickening of stem •Curling/twisting ETHYLENE WHAT?-Colorless odorless gas, damaging at very low amounts. WHEN?-Most commonly seen in late winter when temps are cold and growers reduce venting and “tighten” greenhouses to reduce energy costs. WHY?-improperly vented (or not vented) heaters, cracked heat exchanger, flame poorly adjusted (incomplete combustion), leaky gas lines, exhaust from combustion engines. • Tomatoes are very ethylene sensitive <.05 ppm • If blossoms drop or leaves droop, check the heater! • Plants will grow out of the injury but may not fully recover Oedema Cold Injury Water injury