Pseudomonas syringaepv.maculicolaandXanthomonas campestrispv.amoraciae
Bacterial disease of turnip leave are very serious infection .
There are no extremely effective controls for them , and once they have infected a field , the diseases can quickly spread throughout a whole battleground and renderthe greensinedible .
In addition toblack decompose of Brassica rapa , there are two type of bacteria that stimulate leaf spots : Pseudomonas syringaepv.maculicolaandXanthomonas campestrispv.amoraciae .
Xanthomonas campestris lesions on a tunip leaf. Photo via Alamy.
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bar is the good stakes . Read on to learn how to prevent bacterial leafage spot in turnips .
What You Will Learn
Symptoms
Infections by both types of bacterium start out as speck watersoaked lesions on the leaves . However , the lesions ofXanthomonasstart out Olea europaea putting green , while those ofPseudomonasare Brown University .
As the lesions grow larger and join together , they become chicken at the edge and count like halos . These halos are more detectable inXanthomonasinfections .
The bacterial leafage spot cause byPseudomonasis also bid peppery foliage spot because the lesion look “ peppery . ”
Xanthomonas campestris lesions on a tunip leaf. Photo via Alamy.
When contagion are severe , the leaves can become brickle and die .
Conditions That Favor Infection
Both type of bacterium open rapidly in crocked weather . While the infections typically rise from septic seed , once the bacterium are on the leaf , they can be splashed to fresh plants by rain or irrigation .
These disease can also be spread by equipment or even on contaminated flush .
The bacterial leafage touch stimulate byPseudomonasis likely to be a job in the early spring or descend because the bacterium thrive at cooler temperature . It is most potential to make infection when the daytime highs are 65 F to 75 F.
In direct contrast , the disease stimulate byXanthomonasis more likely to occur at tender temperatures such as during the summer .
How to Prevent Bacterial Leaf Spot
Since these diseases are so difficult to eradicate once they break , preventing infection is critical .
Only Use Quality Seed
Since the most uncouth elbow room that your plants can get infected is contaminated seed , initiate with high quality come can greatly minimize the chances of infection .
To avoid disease , many germ companies develop their plants in dry climates , which are much less likely to have bacterial infection .
Seeds are often tested for black rotting . This trial will detect the close related bacterium that make theXanthomonasleaf situation . However , there is no test for the bacterial foliage spot caused byPseudomonas .
If you are not sure about the quality of your seed , you could heat treat it by soaking the seeds in live water for 20 minute of arc at 122 F.The Ohio State Universityoffers instructions on how to care for your seed .
However , even if you start with disease - innocent works , nearby garden or weeds can be a informant of infection .
Crop Rotation
These bacteria do not survive well in the dirt , but they can prevail on plant debris . you may avoid infection from old crop if you set on soil that has been free of cruciferous plant for the old two geezerhood .
Control Weeds
Since wild cruciferous plant can be hosts for the bacterium that have leaf patch , master grass can greatly reduce the prospect of infection . Wild mustard greens , shepherd ’s handbag , wild radish plant , and swinecress are all rough-cut cruciferous green goddess that can harbor these pathogens .
Sanitation
Be careful not to shift soil from areas that have disease to plants that have not been infected . Clean your hands , boots , and tools between areas .
Also , do n’t mould in your garden when it is wet because that can easily spread out the pathogen between plant .
Irrigation
In gain to the possibility of spread out the bacteria by the water that splashes during the irrigation mental process , frequent irrigation keeps the plants moist and favors the development of bacterial leaf dapple .
Treating Infected Turnip Plants With Copper
If you catch the disease ahead of time , you have some prospect of save the rest of your plants if you use cop sprays . Liquid copperis available from Arbico Organics .
BONIDE ® Liquid Copper Fungicide
Be sure to spray the tops and bottom of the inning of the leaves . Spray every 7 - 10 days throughout the growing season , and reapply after rain .
However , if the environmental conditions favor infection , you may not be able-bodied to redeem your harvest .
Bacterial Leaf Spot Can Threaten Your Turnip Crop
The disease caused byPseudomonas syringaepv.maculicolaandXanthomonas campestrispv.amoraciaespread quickly and can devastate whole planting of turnips .
embed fair seed is a critical way to avoid contagion . However , the disease can spread out from weed and nearby gardens or fields , so you need to stay argus-eyed .
employ copper at the first sign of infection might be able-bodied to economize your crop , but there are no guarantees .
Andread on for information on other diseases of turnipsto admit :
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About
Helga George , Ph.D.
