Effects of sowing date and insecticides on cereal aphid populations and barley yellow dwarf virus on barley in Kenya

A - Papers appearing in refereed journals

Wangai, A. W., Plumb, R. T. and Van Emden, H. F. 2000. Effects of sowing date and insecticides on cereal aphid populations and barley yellow dwarf virus on barley in Kenya. Journal of Phytopathology. 148 (1), pp. 33-37.

AuthorsWangai, A. W., Plumb, R. T. and Van Emden, H. F.
Abstract

The effects of the date of sowing and insecticide sprays on aphid populations and barley yellow dwarf virus (BYDV) incidence in barley was studied in Mau Narok, Kenya. Rhopalosiphum padi (L.) and Metopolophium dirhodum (WLK.) were common aphid species, but other cereal aphids present were Rhopalosiphum maidis (Fitch), Stiobion avenae (F.), Schizaphis grammum (Rond.) and Hysteroneura setaria Thom. The incidence of BYDV was significantly decreased in plots sown with seed that had been treated with imidacloprid (NTN‐33893, Gaucho) and subsequently sprayed with foliar insecticide (Cypermethrin). Yield loss due to BYDV was also significantly different between the treatments and between the earlyplanted and the late‐planted crop (P < 0.05). Grain yield and 1000‐grain weight were not significantly different among insecticide treatments in the early‐planted crop. In the late‐planted crop, the yield increase with seed treatment alone was highly significant (P < 0.001), with a yield increase of 36‐43%, more than that of the untreated control. Grain yield was significantly (P < 0.05) negatively correlated with the total number of cereal aphids. as well as with the numbers of R. padi alone.

Year of Publication2000
JournalJournal of Phytopathology
Journal citation148 (1), pp. 33-37
Digital Object Identifier (DOI)doi:10.1046/j.1439-0434.2000.00406.x
Open accessPublished as bronze (free) open access
Funder project or code423
Publisher's version
Output statusPublished
Publication dates
Print01 Jan 2000
Online28 Jun 2008
Publication process dates
Accepted02 Jan 1999
Copyright licensePublisher copyright
PublisherWiley
ISSN0931-1785

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