“The incidence of blindness was monitored in seedling nurseries in New South Wales and Queensland between November and March 2013-14 and outbreaks were found to be correlated with high temperatures and humidity,” Mr Goldwater said. Germinating seed at lower temperatures (below 20 degrees Celsius), avoid growing seedlings at temperatures above 35 degrees Celsius and use misting to reduce leaf temperature in hot conditions. The lettuce that got transplanted into the greenhouse six weeks ago got its second application of full strength fish emulsion yesterday, and the outer leaves are ready to pick. On needled ever… Continue reading on Haifa Group Blindness in lettuce results in multiple heading in mature plants, causing the lettuce to be unsaleable. in response … Also check that there is no J-rooting. “Attempts to induce blindness by irrigating with saline water, chlorinated water, as well as spraying with an insecticide known to cause burning, all induced blindness under hot, humid conditions,” Mr Goldwater said. New research undertaken by applied horticultural research shows that drenching lettuce seedlings with potassium nitrate at transplanting can increase yields by 20 percent. Separate trials were conducted in the field to evaluate methods for reducing transplant shock in lettuce seedlings. Significant transplant shock can result in poor plant stands and a lower percentage cut of good quality lettuce. Figure 5: Cos lettuce head weights at harvest. This fact sheet provides guidance on the ideal age of transplants and tips for avoiding transplant shock. To create a clearer picture of how blindness develops, the project tried to identify factors that could either induce or prevent blindness in susceptible lettuce varieties. Use good-quality, non-saline irrigation water, grow varieties less susceptible to blindness and don’t spray when plants are stressed to avoid burning seedlings. Avoid burning seedlings. Lettuces seldom recover from blindness, developing into a distorted, unmarketable plant. Spacing is more important for head lettuce than with other types. Home Adam Goldwater, of AHR, said the project tried to determine whether the incidence of blindness was correlated with factors such as temperature, humidity, water stress and crop nutrition. Small cells such as 128, 200 or 288 may be used for crops such as lettuce or onions. Growers were surveyed on factors they considered likely to increase blindness, and mitigation strategies. In order to look at how we can help the plant through this time, we’ll divide these stresses into three different categories: environmental changes, physical damage, and nutritional deficiencies. Transplant shock is a check in growth that can occur when seedlings are transplanted from the seedling tray into the field. 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