Citrus Greening : A Deadly Fruit Disease

Citrus greening disease is an important disease of citrus which greatly affects the production of the fruitsin several parts of India.Characteristic symptoms include yellowing of leaf veins and adjacent tissues,followed by premature defoliation, dieback of twigs, decay of feeder rootlets and lateral roots.Infectedfruits are small, lopsided with bitter taste. Such fruits may fall prematurely; while those that remain on the tree do not colour properly, remaining green on the shaded side 

Management:

Routinely scout citrus for signs of greening so that infected trees can be removed. Scouting should be done at least four times a year, or more in areas known to have infected trees. October through March isthe best time for scouting, but symptoms can be present at other times of the year.For effectivemanagement remove infected trees. This is the only way to ensure that they won’t remain a source of infection for other trees. Pruning symptomatic limbs is often ineffective since other parts of the tree maybe infected, but do not show symptoms.Before removing, the tree should be sprayed with a foliarinsecticide to kill any psyllids in order to keep them from moving on once the tree is removed.FocusIntegrated Pest Management (IPM) efforts on using disease-free nursery trees, reducing infectionsources (inoculum) by frequent surveys and diseased tree removal, and suppressing Asian citrus psyllidthrough area-wide management 

Foliar spray:

Spray foliar insecticide prior to tree removal. Increase frequency of scouting in areas where infected treeshave been removedThe complex of natural enemies attacking ACP around the world usually includesvarious species of ladybeetles, syrphid flies, lacewings, spiders.Use soil-applied systemic insecticides onyoung trees. Foliar sprays of fenpropathrin (Danitol 2.4 EC), chlorpyrifos (Lorsban 4EC), petroleum oil (2per cent rate). 

Contact 

Utpal Dey, Ph.D. scholar,Department of Plant Pathology andDr A.P. Suryawanshi, Head in charge, Department of Plant Pathology, Marathwada Agricultural University, Parbhani, Maharashtra, India, email: utpaldey86@gmail.com, mobile: Mob : 8275824103.