In my work place mostly growing chrysanthemum as ct flower. Now a days most of the plants attacked by chrysanthemum rust. According to my observations it is chrysanthemum brown rust. I applied all of the recommended chemicals to cultivation.cultivation maintain at the green house conditions. Somebody can help me to solve this problem.
Hello Wajira,
There are cultural and chemical control methods. These are well published. Here are some links:
http://pnwhandbooks.org/plantdisease/chrysanthemum-rust-brown-rust
http://www.chaseagriculturalconsultingllc.com/resources/pdfs/articlesPdf/51UpdateonRustDiseasesandTheirControl%20.pdf
http://www.ipm.ucdavis.edu/PMG/r280110811.html
http://www.which.co.uk/documents/pdf/chrysanthemum-rusts-151767.pdf
It appears to be easy to control by using resistant cultivars, protecting foliage with triadimefon or mancozeb before rust starts to build up, use of wetting agent required here. Avoid wetting foliage during irrigation as the rust requires water to move. Keep humidity low. Maintaining greenhouse above 32 oC for 24 h can kill spores. As it has no alternate hosts, destroy the infected leaves and crop debris.
Regards
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