Oct. 1, 1925 
Sclerotinia Species Causing Decay of Vegetables 
631 
With the exception of S. intermedia , which stops growth at 30° to 
31° C., all other strains have shown ability to make slight growth 
on potato-dextrose agar at 32° to 33° C. Inoculation experiments 
conducted at this temperature proved negative. 
Ascospores germinate readily in sterile water and nutrient solutions 
throughout a wide range of. temperatures. Successful germination 
has been obtained at temperatures as low as 3° to 4° C. and as high 
as 30° to 31°. 
Experiments show that incipient lesions and contaminated wounds 
will develop decay during transit under refrigeration temperatures of 
40° to 45° F., but that development of new lesions and spreading of 
the fungus from one plant to another during the ordinary transit 
period will be fairly well controlled. Clean, carefully graded vege¬ 
table produce which has been precooled at loading point should 
arrive on the market in good condition if held throughout the trip 
at temperatures of 40° to 45° F. 
A summary of all observations and experiments shows that more 
than 90 per cent of the Sclerotinia cultures isolated from vegetable 
produce on the market during the past four years belong to the 
species S . libertiana. 
LITERATURE CITED 
(1) Appel, O., and Wollenweber, H. W. 
1910. GRUNDLAGEN EINER MONOGRAPHIE DER GATTUNG FUSARIUM 
(link) . Arb. K. Biol. Anst. Land-und Forstw. 8: 1-207, illus. 
(2) Bary, A. de 
1886. UEBER EINIGE SCLEROTINIEN UND SCLEROTIENKRANKHEITEN. 
Bot. Ztg. 44: 377-387, 449-461, 465-474. 
(3) Beach, W. S. 
1921. the lettuce “drop” due to sclerotinia minor. Pa. Agr. Exp. 
Sta. Bui. 165, 27 p., illus. 
(4) Beauverie, J., and Guilliermond, A. 
1903. ETUDE SUR LA STRUCTURE DU BOTRYTIS CINEREA. Centbl. Bakt. 
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(5) Bisby, G. R. 
1921. STEM-ROT OF SUNFLOWERS IN MANITOBA. Sci. Agr. 2l 58-61, 
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(6) Blackman, V. H., and Welsford, E. J. 
1916. STUDIES IN THE PHYSIOLOGY OF PARASITISM. II. INFECTION BY 
botrytis cinerea. Ann. Bot. 30: 389-398, illus. 
(7) Boyle, C. 
1921. infection by sclerotinia libertiana. Ann. Bot. 35: 337-347, 
illus. 
(8) Brierley, W. B. 
1918. the microconidi a of botrytis cinerea. Roy. Bot. Gard. Kew, 
Bui. Misc. Inform. 1918: 129-146, illus. 
(9) Brown, W. 
1915. STUDIES. IN THE PHYSIOLOGY OF PARASITISM. I. THE ACTION OF 
botrytis cinerea. Ann. Bot. 29: 313-348. 
( 10 )- 
1922. STUDIES IN THE PHYSIOLOGY OF PARASITISM. IX. THE EFFECT 
ON THE GERMINATION OF FUNGAL SPORES OF VOLATILE SUB¬ 
STANCES arising from plant tissues. Ann. Bot. 36: 285- 
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(11) Dickson, B. T. 
1920. sclerotinia wilt of greenhouse tomatoes. Phytopathology 
10: 500-501, illus. 
(12) Dickson, F., and Fisher, W. R. 
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Phytopathology 13: 30-32, illus. 
