Diseases Citrus greening disease This disease causes sectorial yellowing of leaves. Fruits are small and lopsided. Tree may blossom out of season. It is transmitted by citrus pysllid. Control • Control psyllids with insecticides. • Plant seedlings from certified nurseries. • Rogue infected trees and disinfect budding tools from one seedling to the next. Citrus gummosis Bark rots on the roots or the trunk and the branches. In early stages of infections gum oozes from the infected parts hence the name gummosis. Leaves start yellowing and the twigs dieback and the tree eventually dries up and die if untreated. Control • Surgically remove the bark or burn it with blue flame from a propane torch. • Fertilize and irrigate the treated trees. • Use tolerant rootstocks - Cleopatra mandarin. • Weed from the tree trunk outwards. • Avoid planting on heavy or waterlogged soils. • Plant seedling with the bud union at least 6cm above the ground level. Management of citrus pests and diseases Kenya Agricultural Research Institute P.O. Box 57811-00200, NAIROBI. Tel: 254-20-4183301-20, Fax: 254-20-4183344 Email: [email protected]Website: www. kari.org Compiled by: Kega,V.M. For more information contact: Centre Director, KARI Katumani, P.O. Box 340- 90100, Machakos Tel: +254 44 20495, 20395/8, 21638, 20422 Fax: +254 44 21122 Email: [email protected]KARI information Brochure series / 16 /2008 Ksh. 20 Citrus greening disease symptoms
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Management of citrus pests and diseases - KALROkalro.org/fileadmin/publications/brochuresII/Management_of_citrus_pests.pdfCitrus yields are often low and fruits are of poor quality
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DiseasesCitrus greening disease
This disease causes sectorial yellowing of leaves. Fruits
are small and
lopsided. Tree
may blossom out
of season. It is
transmitted by
citrus pysllid.
Control• Control psyllids with insecticides.
• Plant seedlings from certifi ed nurseries.
• Rogue infected trees and disinfect budding tools
from one seedling to the next.
Citrus gummosis
Bark rots on the roots or the trunk and the branches. In
early stages of infections gum oozes from the infected
parts hence the name gummosis. Leaves start yellowing
and the twigs dieback and the tree eventually dries up
and die if untreated.
Control• Surgically remove the bark or burn it with blue fl ame
from a propane torch.
• Fertilize and irrigate the treated trees.
• Use tolerant rootstocks - Cleopatra mandarin.
• Weed from the tree trunk outwards.
• Avoid planting on heavy or waterlogged soils.
• Plant seedling with the bud union at least 6cm above
the ground level.
Management of citrus pests and
diseases
Kenya Agricultural Research InstituteP.O. Box 57811-00200, NAIROBI.