DISEASES DUE TO FUNGI 1? 
wilted plants were transferred to high temperatures to 
ascertain if they would recover and if such a recovery 
would continue when the plants were returned to lower 
temperatures. The results which are shown in Table 6 
indicate that wilted plants recover when the average 
TABLE 6. 
Length of Time in Length of Time after 
No. of Wilted | Shaded Cucumber Effect of High Returning to Average 
Plants. House. Average Temperature. Temp. 20°C. before 
Temp. 25° C, Plants again Wilted. 
12 1 day Recovered 15 hours 
12 2 days Do. 15 hours 
12 7 days Do. 2 days 
12 14 days Do. 8 days 
12 30 days Do. 16 days 
12 75 days Do. 30 days 
—d 
temperature is raised to 25° C. and they are shaded 
(Figs. 15 and 16). When such a temperature is 
operative for a short time the effect is not a lasting one 
for the plants rapidly wilt again when the temperature 
TABLE 7. 
No. of No. of Days Wilt has Per Cent Recovered Per Cent Recovered 
ae : : in Shaded Cucumber |in Unshaded Cucumber 
Plants, | "°°"experiment. | House. Average | House. Average 
20 2 100 100 
20 Z 100 100 
20 14 100 100 
20 21 100 90 
20 30 100 80 | 
is lowered. Longer exposure to the high temperature 
produces a more lasting result, for after 75 days at 25° C. 
the plants remained turgid for 30 days at a temperature 
favourable to wilt. Table 7 compares the percentage of 
wilted plants which recover when transferred to a shaded 
house at an average temperature of 25° C. with that of 
