OF INTEREST TO FRUIT GROWERS. 



23 



Two Monster Bunches of Grapes. 



These Iwo buncho of hot-liouse grapes were shown at the recent Provincial Fruit, Flower and Honey Show, by Mr. John 

 Chambers, City Park Coinnn^sioner, Toronto, and attiai ted a great deal of attention. One weighed six pounds, two ounces, 

 and the second four poun Is. < ne ounce. The ),i apes were grown in an ordinary greenhous-. (Photograph taken specially for 

 The Canadian Horticulturist.) 



the most injurious diseases of the grape in 

 Canada, with the best remedies known : 



Anthracnose, Bird's Eye Rot, Scab 

 (Sphacelouia Ampelinum). This is the only 

 g^rape disease which has given any trouble 

 at the Central Experimental Farm. It i-. 

 difficult to control by spraying, but fortu- 

 nately, only a few varieties have been af- 

 fected, Lindley being the worst. This fun- 

 jus attacks leaves, stems, and fruit, but it is 

 on the fruit where it is most noticed. Hie 

 disease is apparent in depressed patches ex- 

 tending along the stems, which checks the 

 growth. There are also reddish brown 

 patches on the leaves. 



The stems of the clusters of grapes are 

 frequently aftected, and when the disease 

 occurs there the fruit remains green and 

 eventually withers, making an imperfect 

 bunch. The disease on the fruit occurs in 

 roundis'h brown spots with a purplish mar- 

 gin, giving somewhat the appearance of a 

 bird's eye. Frequently spots unite and 

 form a large irregular area. This is a very 

 difficult disease to control, and though 

 spraying with Bordeaux has not checked 't 

 to any extent, spraying before the buds 

 open, before blossoming, after fruit has 



set and ten days later with Bordeaux mix- 

 ture, is recommended. 



IS INVADING CANADA. 



lUack Rot (Laestadia Bidwellii). Up to 

 recent years this disease was thought to have 

 reached its northern limit south of Lakes 

 Erie and Ontario, but during the last few 

 years in Essex county, and more recently 

 in the Niagara peninsula, it has caused much 

 damage. The appearance of this disease 

 has already been described, but something 

 further may be said regarding it. The 

 spores live over winter on the vine and in 

 the affected grapes, and germinate when 

 growth starts in the spring. The disease 

 attacks the leaves and shoots, the leaves 

 showing the disease in roundish reddish 

 brown patches and on the stems, small, long 

 shaped, dark, brown, slightly depressed 

 spots, on the surface of which appear the 

 characteristic postules of the black rot. 



When conditions are favorable the disease 

 only requires 8 to 12 days from the time the 

 spore germinates until the mycelium has run 

 its course through the fruit and has pro- 

 duced new spores. Before the grape shrinks 

 much in size the mycelium concentrates, as 

 it were, in small masses underneath the skin, 



