About: Psyllid yellows

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Psyllid yellows is a disease of potatoes infested by the potato/tomato psyllid, Bactericera cockerelli. The symptoms are a marked yellowing of the leaves, an upright appearance to the leaves, with severe cases resulting in early death of the plant. Tuber initiation and growth is affected. Many small tubers are formed, frequently misshaped. In some cases, the tubers seem to have lost sprouting inhibition and have begun sprouting before harvest. At later stages, the tubers sprout weakly, if at all. A summary of symptoms from plants in New Zealand with photos of tomato and capsicum plants:

Attributes	Values
rdf:type	yago:Abstraction100002137 yago:Attribute100024264 yago:Condition113920835 yago:Disease114070360 yago:IllHealth114052046 yago:Illness114061805 yago:PathologicalState114051917 yago:PhysicalCondition114034177 yago:PlantDisease114276936 disease yago:State100024720
rdfs:label	Psyllid yellows (en)
rdfs:comment	Psyllid yellows is a disease of potatoes infested by the potato/tomato psyllid, Bactericera cockerelli. The symptoms are a marked yellowing of the leaves, an upright appearance to the leaves, with severe cases resulting in early death of the plant. Tuber initiation and growth is affected. Many small tubers are formed, frequently misshaped. In some cases, the tubers seem to have lost sprouting inhibition and have begun sprouting before harvest. At later stages, the tubers sprout weakly, if at all. A summary of symptoms from plants in New Zealand with photos of tomato and capsicum plants: (en)
name	Psyllid yellows (en)
dcterms:subject	Candidatus taxa Bacterial plant pathogens and diseases Potato diseases
Wikipage page ID	18206330 (xsd:integer)
Wikipage revision ID	1124421844 (xsd:integer)
Link from a Wikipage to another Wikipage	Candidatus Candidatus taxa Capsicum Potato Bactericera cockerelli Bacterial plant pathogens and diseases Potato diseases Psyllid Zebra chip dbr:Liberibacter_solanacearum
sameAs	Psyllid yellows Psyllid yellows Psyllid yellows
vectors	Bactericera cockerelli (en)
dbp:wikiPageUsesTemplate	dbt:Cn dbt:Reflist dbt:Short_description dbt:Infobox_plant_disease
distribution	New Zealand (en)
hosts	Potato
has abstract	Psyllid yellows is a disease of potatoes infested by the potato/tomato psyllid, Bactericera cockerelli. The symptoms are a marked yellowing of the leaves, an upright appearance to the leaves, with severe cases resulting in early death of the plant. Tuber initiation and growth is affected. Many small tubers are formed, frequently misshaped. In some cases, the tubers seem to have lost sprouting inhibition and have begun sprouting before harvest. At later stages, the tubers sprout weakly, if at all. It is thought that a toxin produced by the nymph stage of the psyllid causes these symptoms. If pest control occurs at an early stage of the disease, the plants appear to be able to recover. A very similar disease has been described in tomatoes. In addition to the foliar symptoms, mature fruit is very much smaller, tends to have a pointy end, and frequently they occur in larger clusters of fruit than normal. In severe cases, the yellowing progresses to plant death. In addition to psyllid feeding, a new species of bacterium 'Candidatus Liberibacter solanacearum' has been associated with this disease. Capsicum crops show a similar fruit effect, but generally with no, or very little, foliar symptom. A summary of symptoms from plants in New Zealand with photos of tomato and capsicum plants: * Symptoms in tomato plants: Include leaf curling and yellowing stunting of the plant, fruit occasionally misshapen with a strawberry like appearance. The leaf axial or stalk may also become very long and the fruit development may be uneven. * Symptoms in capsicum plants: Include pale green or yellow leaves with spiky tips. Leaves may be misshapen. Leaf stalks may be misshapen, leaf stalks appear short, flowers may drop prematurely and parts of the plant may die back. Symptoms may vary in severity between varieties. * Symptoms in potato tops can include these being smaller than normal, yellowing and the tops can develop a scorched appearance before premature collapse. This same Liberibacter has recently been found in potatoes in New Zealand and in the US. The potato disorder/disease "Zebra chip" is related in that 'Candidatus Liberibacter solanacearum' has been reported from Zebra Chip potatoes in both Texas and New Zealand. (en)
causal agents	Candidatus Liberibacter solanacearum (en)
EPPO codes	LIBEPS (en)
gold:hypernym	Disease
prov:wasDerivedFrom	wikipedia-en:Psyllid_yellows?oldid=1124421844&ns=0
page length (characters) of wiki page	4168 (xsd:nonNegativeInteger)
foaf:isPrimaryTopicOf	wikipedia-en:Psyllid_yellows
is Link from a Wikipage to another Wikipage of	List of potato diseases Fauna of Saskatchewan Bactericera cockerelli List of taxa with candidatus status Zebra chip
is foaf:primaryTopic of	wikipedia-en:Psyllid_yellows

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