Most diseases of the barque on fruit tree cause cankers or knots . Some diseases are fatal , while others just result in a smaller crop . Chemical intervention can aid prevent diseases , but are not effective in control disease after a tree diagram is infected . right cultural method of worry for yield trees are the best path to prevent disease .
Causes
disease that affect the bark of yield tree diagram occur sporadically during certain periods of increment and with specific environmental condition . bacterium , fungi and viruses embark opened hurt areas of bark induce by conditions , worm , pruning , mowers or other mechanically skillful mean . Fruit tree are especially vulnerable to diseases during flower season , because pathogen can easily enter the flowers .
Stone Fruit Diseases
Edward Durell Stone fruit are those with easygoing edible pulp around a hard pit . tree in the Prunus sept , such as apricots , cherries , peaches and plums , grow stone yield .
A coarse disease that affects Edward Durell Stone yield is mordant slub , which is triggered by the fungus Dibotryon morbosum . Elongated hard black knots girdle and kill small-scale branches . Black naut mi also grows on tree diagram trunks , but rarely gird the trunk .
The fungus species , Valsa , causes oval canker on the branches and trunk of trees . The cankers continue growing until it deaden and kills the affected area .
crownwork galls are cause by a soil borne bacterium , Agrobacterium tumefasciens . Large corky or woody tumors grow on the trunks of affect trees at or just above the soil level .
Pome Fruit Diseases
Pome yield have unshakable comestible flesh and many small hard seeds . Apple ( Malus sp . ) and pear ( Pyrus sp . ) trees produce pome fruit .
The fungus mintage , Nectria , do 2 kinds of cankers . The open canker turn in homocentric circles as healthy plant tissue grows over infected tissue . The closed cankers are covered by dead bark . Nectria fungus also affects the yield .
The Botryosphaeria fungus causes White Rot . Small round spots exposit to canker with slightly depressed shopping center . White Rot also affects the yield . Burrknot is hoi polloi of abnormal root tissue that grows from the rootstock of apple trees . It stunts the growth of the affected tree and can girdles the tree trunk . The weakened tree is nonimmune to give out during hard winds or with a heavy crop .
Cultural Treatments
yield Tree should be planted in full sun in well - drained soil . Wet or compact grime weaken the trees and makes them more susceptible to diseases . The tree should be engraft the recommended length aside to allow for good air circulation , which helps prevent fungal disease .
infect limb and branches should be pruned out and destroy . folio , rotten fruit and other rubble under diseased fruit Tree should be transfer and destroy . If pathologic plant textile is added to a compost pile , it could scatter the disease further .
Chemical Treatment
yield tree diagram should be fertilized at the recommended pace and time to further healthy increment . Insecticides can be used to get disembarrass of insects that carry diseases .
Most fruit tree diseases can not be controlled but they may be prevented by applications of a fungicide . Some types of fungicide for yield Tree are copper , sulphur and Bordeaux , which is a mixture of calcium hydroxide and fuzz sulfate . Fungicides should be applied according to the manufacturer ’s directions .
The local county extension office can offer information on fertilization of fruit tree diagram , as well as chemical substance treatments for fruit tree diseases .
