REPORT OF THE HORTICULTURIST. 
TREATMENT FOR GOOSEBERRY MILDEW.* 
Cn. »Grose. 
SUMMARY. 
For three seasons, Bordeaux mixture, lysol and formalin have 
been compared with potassium sulphide, the latter giving the best 
results in all three series. 
The Bordeaux mixture proved comparatively valueless, as in 
but one series of tests did treated bushes show less mildew than 
check bushes; formalin in the strongest solution, 1 oz. to 1 gal. 
water, gave fair results, but weaker solutions ranked with the 
Bordeaux mixture; lysol gave promising results, coming next to 
the potassium sulphide in reduction of mildew injury. 
With one exception, Bordeaux mixture, very early spraying 
gave better results than medium early or late treatments. 
Winter treatment was tested during one season, but did not 
give sufficiently favorable results to justify recommendation. 
INTRODUCTION. 
The gooseberry mildew generally makes its appearance during 
the last half of May or first half of June. It is first noticed as 
glistening, frost-like spots on the fruit on the lower part of the 
bush where there is usually dense shade. As the disease progresses 
the spots enlarge, turn dark brown and form a felt like covering 
over a part, or all, of the berry. In a slight attack the disease 

* Reprint of Bulletin No. 161. 
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