Note. — Arsenica] poisons for control of cureulio may be added to No. 2. Tobacco extracts and soap may be added 

 for control of plant lice. 



CHERRY 



Leaf Spot {Cylindrosporium padi, Karst.). — This disease, which is also 

 called "shot hole," causes discolored circular spots usually with reddish 

 or purple border, eventually becoming brown and breaking into a hole and 

 often resulting in a defoliation of the tree. When severe it is very injurious 

 to the growth and health of the tree. 



Treatment. — Spray with lime-sulphur or with Bordeaux mixture. 



Black Knot. — See Plum. 



Crown Gall. — See Apple. 



Brown Rot. — See Peach. 



Powdery Mildew (Podosphcera oxyacanthce [D. C], DeBy.). — Similar 

 to S. malt of the apple. 



Spray Table for Sweet Cherries. 



1. Treatment same as first treatment for apple. 



2. Treatment same as second treatment for peach, but given immediately after the petals fall. 

 3 Repeat treatment 2 when fruit is about the size of small pea. 



4. Repeat treatment 2 after the fruit is picked. 



CITRUS FRUITS 



Brown Rot (Pythiacystis citrophthora, Sm. and Sm.). — This disease 

 of the California fruit is sometimes the cause of heavy losses. It is caused 

 by a fungus which is white in mass. It occurs in the orchard and packing 

 houses causing a rot with a peculiar rancid odor. Very slightly infected 

 fruits rot during transportation. It is most abundant in wet weather or 

 on low ground after irrigation. 



Treatment.— -It is spread by contact and can be controlled by using a 

 heavy straw mulch or cover crop under the trees and by disinfecting the 

 fruit in the packing house. 



Black Rot (Alternaria citri, Pierce). — This disease of the navel orange 

 causes a premature ripening. It usually enters the fruit through the 

 navel, causing an internal rot accompanied by a reddish color. The 

 diseased fruit should be burned or buried. 



Stem End Rot and Melanose (Phomosis citri, Fawcett). — This disease 

 is most common on mature packed fruit, causing a circular patch of soft 



