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The resistance of corn to the herbicides, 2-chloro-4, 6-bis(ethylamino)-s-triazine [simazine] and 2-chloro-4-ethylamino-6-isopropylamino-s-triazine (atrazine), may be related to stalk rot and corn borer resistance. Of five inbred lines of corn studied, three with known resistance to stalk rot and corn borer were found to be much more resistant to simazine and atrazine than were two inbreds which were susceptible to stalk rot and corn borer.
Thirteen treatments during a 5-year period with a 1 : 1 mixture of the propylene glycol butyl ether esters of 2,4-dichlorophenoxyacetic acid (2,4-D) and 2,4-5 trichlorophenoxyacetic acid (2,4,5-T) were required to eradicate an established stand of kudzu, Pueraria lobata (Willd.) Ohwi.
Catalase and peroxidase activities were run at several ages on two lines of corn (Zea mays L.)—GT112 RfRf, resistant, and GT112, susceptible to 2-chloro-4-ethylamino-6-isopropylamino-s-triazine (atrazine). Atrazine significantly decreased catalase activity in GT112, while in treated GT112 RfRf catalase activity was usually significantly increased. Catalase activity was higher in GT112 RfRf than in GT112 for both treatments at all ages. GT112 RfRf had a higher peroxidase activity than GT112 when both were untreated, but when treated with atrazine there was no overall trend.