snapdragon remain a popular bedding plant and one of the most popular cut flower crop for cultivator sell directly to local wholesale and retail florists . While there are several pests and disease that can adversely affect this harvest , some agriculturalist have been seeing snapdragon rust in their greenhouses and high tunnels this natural spring .
snapdragon by their very nature produce the high timbre flowers when grown under cool temperatures . Unfortunately , the pathogen that causes snapdragon rust , Puccinia antirrhiniis favored by 550F to 700F temperatures , but it is also curb by temperature above 800F. Symptoms of snapdragon rust are very subtle at first . Growers may watch over small lily-livered or greensick protuberance or swelling on the leaves . The upper leaf aerofoil will develop yellow place and the lower leaf open will be delineate with concentric rings of reddish - browned pustule that have come forth through the ruptured epidermis .
Wind borne spores , septic cut , or plugs can be a reference of snapdragon rust in nursery and gamy tunnels . In my area , strength track flower growers overwinter snapdragon in their gamey burrow . These overwintering snapdragon frequently are the author of contagion on many mathematical process . The cool experimental condition in the high burrow pair off with the modified management of the crop under row covers creates a petri - dish like surroundings forPuccinia antirrhinito flourish undetected . As vents are opened in greenhouses and sidewalls are rolled up on eminent tunnel lead - blown spores can make their way from the septic plants in the gamey tunnel to the plants in the greenhouse .
raiser that have had a history of snapdragon rust in their operation should take the play along ethnic praxis :
Fungicides can be an efficient management tool in preclude snapdragon rust if ethnic controls have proven ineffective at your operation . In selecting antifungal please splay mathematical product with different modes of action ( unlike FRAC codes ) and consider the re - entry intervals for the fungicide product that will be applied . Also , before purchasing or even deploying a specific fungicide in your operation survey the recording label carefully . Please be cognizant that some fungicides may hurt certain snapdragon cultivar if the high-pitched label pace are utilise .
Translaminar fungicidal products may offer the best protection against snapdragon rust in greenhouses and gamey tunnels . For specific fungicide good word please contact your local Extension Educator to determine what is labeled in your DoS or please touch Penn State Extension Educator , Tom Ford at[email protected ] .
Source : eGRO Blog ( Thomas Ford )
