Onion Thrips in Iowa

dc.contributor.author Horsfall, J.
dc.contributor.author Fenton, F.
dc.contributor.department Extension and Experiment Station Publications
dc.date 2018-02-18T18:12:12.000
dc.date.accessioned 2020-06-30T00:55:54Z
dc.date.available 2020-06-30T00:55:54Z
dc.date.embargo 2017-07-28
dc.date.issued 2017-07-28
dc.description.abstract <p>1. Onion thrips have long- been an established pest in Iowa and in certain years cause severe loss to the onion crop of this state.</p> <p>2. Young and adults produce the “ white blast” of onions by sucking the juices from the leaves.</p> <p>3. Hot, dry weather in July and August is favorable to the rapid multiplication and subsequent spread of the onion thrips.</p> <p>4. The onion thrips spreads from infested fields to those uninfested, chiefly in the winged adult stage, by drifting in the air with the wind.</p> <p>5. There are four principal sources of infestation in the spring, namely: set or multiplier onions, greenhouses where tomatoes or cucurbits are grown, piles of refuse such as tops, culls and screenings which are left in the field over winter, and wild perennial host plants.</p> <p>6. These sources of infestation can be very largely eliminated, with the result that thrips epidemics can be at least greatly reduced.</p> <p>7. Results of three seasons’ spraying tests with nicotine sulfate and soap for the control of the onion thrips, has demonstrated that under Iowa conditions this is not effective in seasons when these insects are abundant enough to cause damage. This is largely because this insecticide does not kill the eggs within the leaf, nor the pupae in the soil at the base of the plants, and also because many larvae escape by being in the axils of the leaves. Furthermore, many winged adults escape and later rein fest the sprayed plants.</p> <p>8. Where comparatively few plants are infested early in the season, the thrips breeding on them can be controlled to advantage by spraying with nicotine sulfate and soap to prevent later infestation of larger areas. Control is effective at this time because the plants are small and practically all the insects can be hit by the spray.</p>
dc.identifier archive/lib.dr.iastate.edu/bulletin/vol17/iss205/1/
dc.identifier.articleid 1309
dc.identifier.contextkey 10499992
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath bulletin/vol17/iss205/1
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/11520
dc.source.bitstream archive/lib.dr.iastate.edu/bulletin/vol17/iss205/1/Bulletin_v17_n205.pdf|||Fri Jan 14 17:44:49 UTC 2022
dc.subject.disciplines Agriculture
dc.subject.disciplines Entomology
dc.title Onion Thrips in Iowa
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isJournalIssueOfPublication cae29741-cdad-4606-91ab-f6fce86b6474
relation.isOrgUnitOfPublication 302bd0e8-f82f-406a-88b5-c8f956b5f77b
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