![\"tifton](\"https:\/\/site.extension.uga.edu\/colquittag\/files\/2016\/08\/tifton-DBM-pop.png\")
<\/a>![\"Lewis](\"https:\/\/site.extension.uga.edu\/colquittag\/files\/2016\/08\/Lewis-Rd-pop.png\")
<\/a><\/p>\nHelpful tips\u00a0on Managing Insecticide Resistance<\/strong><\/p>\n If a DBM control failure occurs with an MOA, rotate to an alternate MOA.<\/p>\n Rotate insecticides with different IRAC groups each DBM generation (4 weeks in mild to 2.5 weeks in hot seasons).<\/p>\n Reserve the most effective insecticides to protect the harvested portion of the crop.<\/p>\n Never use insecticides off-label, especially in transplant production. Following labels helps to manage resistance.<\/p>\n Where year-round crop production occurs, use a host-free period during the warmest months of the year (2 or more DBM generations).<\/p>\n Consider using a regional selection-free period of one MOA to reduce the carryover of DBM resistant to a specific MOA from one season to the next.<\/p>\n If sequential plantings of cole crops are required, then avoid adjacent plantings and rotate IRAC groups per DBM generation time across all plantings.<\/p>\n <\/p>\n Biology of the Diamondback Moth<\/strong><\/p>\n Except for the adult stage, DBM completes its whole life cycle on the plant. DBM moths lay eggs singly on the underside of leaves. The larvae hatch in a day or so and feed on the underside.<\/p>\n Initial damage is small incomplete holes caused by young larvae and larger complete holes caused by mature larvae. The holes become larger as the leaf develops. The entire plant may become riddled with holes under moderate to heavy populations. Larvae also feed in the developing heads of cabbage, causing deformed heads and encouraging soft rots. The pupae of DBM are green and encased in a netlike cocoon attached to the foliage. Pupae reduce quality as a contaminant.<\/p>\n DBM attacks all types of leafy greens and cole crops during all parts of the growing season. DBM is a cold-hardy species, so it can survive cold temperatures in the caterpillar stage. During temperatures below approximately 50\u00b0F, larvae cease to feed. As the temperature rises above this mark, feeding resumes. The life cycle is retarded during cooler temperatures. In contrast to this, DBM populations may increase dramatically at temperatures above approximately 80\u00b0F. The life cycle may be as long as 50 days at low temperatures and as short as 15 to 20 days during high temperatures. There may be 10 or more generations during warm years.<\/p>\n Suppression of DBM populations with preventive treatments is the most efficient control method. Preventive treatments with biological compounds should be made on a five-day interval. A seven-day interval may be used if no worms are found, especially during cool winter weather. Cleanup sprays may be necessary periodically. Heavy rain showers may reduce populations dramatically. Monitor crops two to three times per week and make decisions on changes in control strategies.<\/p>\n<\/a> <\/a> <\/a><\/a><\/p>\n