Open AccessEpidemiology and Management of Petunia and Tomato Late Blight in the Greenhouse
Author(s) -
M C Becktell,
Margery Daughtrey,
William E. Fry
Publication year - 2005
Publication title -
plant disease
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.663
H-Index - 108
eISSN - 1943-7692
pISSN - 0191-2917
DOI - 10.1094/pd-89-1000
Subject(s) - biology , petunia , blight , phytophthora infestans , lycopersicon , trichoderma harzianum , sporangium , solanaceae , mancozeb , fungicide , greenhouse , metalaxyl , horticulture , agronomy , botany , biological pest control , spore , biochemistry , gene
Factors affecting the management of petunia and tomato late blight, caused by Phytophthora infestans, under greenhouse conditions were investigated. Late blight-infected petunias (Petunia × hybrida) and tomatoes (Lycopersicon esculentum) each produced sporangia that were dispersed throughout the greenhouse via air currents. Infected petunias produced and released fewer sporangia than infected tomatoes, but infected petunias released sporangia two times longer. Surface-directed irrigation reduced disease incidence compared with overhead irrigation that wetted the foliage. The fungicides dimethomorph-mancozeb, fosetyl-Al, azoxystrobin, and dipo-tassium phosphonate/phosphate suppressed late blight development, as did the plant defense activator acibenzolar-S-methyl. All products were applied twice at 7-day intervals. The other plant defense activator (harpin protein) and the bioantagonists (Trichoderma harzianum, Glio-cladium virens, and Bacillus subtilis) were ineffective at the rates tested.