Open AccessControl of Late-Season Fall Armyworm Infestation of Minnesota Sweet Corn, 1990
Author(s) -
W. D. Hutchison,
Joshua J. Lee
Publication year - 1991
Publication title -
insecticide and acaricide tests
Language(s) - English
Resource type - Journals
ISSN - 0276-3656
DOI - 10.1093/iat/16.1.74a
Subject(s) - sprayer , infestation , instar , randomized block design , larva , fall armyworm , biology , horticulture , acre , agronomy , crop , botany , gene , biochemistry , recombinant dna , spodoptera
This experiment was conducted at the Rosemount Agricultural Experiment Station, Rosemount, Minn. A very heavy infestation of FAW was observed 29 Aug in 'Jubilee' sweet corn planted 29 Jul. Within the field, two-row plots, 25 ft long, were arranged in a randomized complete block design. Pretreatment assessment of the FAW infestation indicated an average of 78 larvae/20 plants with the percentage of larvae in each instar as: I, 49%; II, 38%; and HI, 13%. Egg masses were also abundant. All treatments were applied 29 Aug with a backpack CO2 sprayer using one flat-fan (LF-3) nozzle/row, delivering 27 gal/acre at 40 psi. Liquid sprays were directed over the top of the whorl. Treatments were evaluated 5 Sep (7 DAT) by recording the number and instar of live larvae/plant from each of the 20 plants/plot (80/treatment).
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