Planting/Multiplying CIMMYT Maize Seed for Export

Most maize seed destined for international distribution is produced in CIMMYT’s maize experiment station in Tlaltizapan (State of Morelos), a site with very low disease incidence. During the crop cycle, nurseries are periodically inspected in the field; plants showing symptoms are discarded. After harvest, all seed that will be included in an international trial is carefully checked for the presence of seed-transmitted pathogens of quarantine interest in countries of destination.

Maize seed is treated before shipment with a slurry containing 40 ml of acephate (31% a.i.), 2.61 ml of fludioxonil (40.3 % a.i.), 1.09 ml of metalaxyl (32.3% a.i.), 5 ml of adherent and 31.3 ml of water per kg of seed.

Fludioxonil [4-(2,2-difluoro-1,3-benzodioxol-4-yl)pirrole-3-carbonitrile] is a non-systemic fungicide belonging to the phenypirrole group active against Fusarium spp., Rhizoctonia spp., Tilletia spp., Helminthosporium spp., and Septoria spp. when applied as seed treatment in cereal crops. Toxicity class is WHO III (slightly hazardous).

Metalaxyl-M [methyl-N-(methoxyacetyl)-N-(2-6-xylyl)-D-alaninate] is a systemic fungicide belonging to the phenylamide-acylalanine group and is the more biologically active optical isomer of the two mirror molecules which comprise metalaxyl. It is active against fungi of family Peronopsporaceae and provides lasting control of seedling diseases. Toxicity class is WHO II (moderately hazardous).

Dimethyl N,N'(thiobis((methylimino) carbonoyloxy)) bisethanimidothioate is a systemic insecticide active against a wide range of chewing and sucking insects. Toxicity class is WHO III (slightly hazardous).

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