Curled brown edges - Ask Extension
My Rudbeckia leaves are browning at the edges and curling. As you can see from the first picture there is no evidence of infestation. Is there an...
Knowledgebase
Curled brown edges #875861
Asked July 03, 2024, 5:23 PM EDT
My Rudbeckia leaves are browning at the edges and curling. As you can see from the first picture there is no evidence of infestation. Is there anything I can do?
Larimer County Colorado
Expert Response
Hi Ken,
Just prune off those leaves. It's been really hot and perhaps those leaves didn't have the water/resources for the plant to support their growth. Fortunately the rest of the plant looks healthy - and there are still plenty of leaves!
Just prune off those leaves. It's been really hot and perhaps those leaves didn't have the water/resources for the plant to support their growth. Fortunately the rest of the plant looks healthy - and there are still plenty of leaves!
Thank you very much.
The grasshoppers are killing so many of my perennials, especially my Echinacea. What is your suggestion for spraying a deterrent Do all of the chemicals need to be resprayed after rain?
Hi Ken,
Because these plants are in flower - or will soon be in flower - the use of any insecticides is discouraged since they can harm beneficial insects. Instead, cover or net desirable plants that you wish to protect, like vegetables or prized flowers. And also understand and accept that injury will occur this year. The plants will recover.
Because grasshoppers are so mobile, contact insecticides work best - you will actually need to directly spray the grasshoppers. This method of control is difficult.
Because these plants are in flower - or will soon be in flower - the use of any insecticides is discouraged since they can harm beneficial insects. Instead, cover or net desirable plants that you wish to protect, like vegetables or prized flowers. And also understand and accept that injury will occur this year. The plants will recover.
Because grasshoppers are so mobile, contact insecticides work best - you will actually need to directly spray the grasshoppers. This method of control is difficult.
We moved here (Trilby and Timberline) 5 years ago and the grasshoppers have been an issue I'm sure since before then. I alone have seen 7 different species. there seems to be no end. BTW what are you doing in on the fourth of July. Have a good weekend.
There's actually over 100 species of grasshoppers in Colorado!
https://agsci.colostate.edu/agbio/ipm-pests/grasshopper/
Happy 4th to you, too!
https://agsci.colostate.edu/agbio/ipm-pests/grasshopper/
Happy 4th to you, too!
