48 DIPLODIA CORCHORI SYD. 
(3) One stem infected on a lateral shoot and enclosed in a glass lamp 
chimney. This infection took but did not rmg the stem ; the plant remained 
healthy. 
Experiment XIII. Infected five plants at the base of lateral shoots, and 
covered infections with cloth on 20th September, 1918. Four infections took—one 
plant was dead on 28th September, 1918, and three other plants died between 18th 
October, 1918, and28th October, 1918. In this experiment out of five infections 
only one resulted in rapid death of the host. This result should be compared with 
the weather at the time of the infections (PI. VIII) ; the influence of humidity and 
temperature upon the success or failure of inoculations is considered below with 
reference to some of the inoculations during 1919. 
The following experiments were carried out in 1919. 
Experiment XIV. In this experiment the inoculations were all done upon 
plants in pot culture. In each case the infection was carried out by placing a small 
piece of an actively growing agar culture of D. Corchori on the living stem and 
jacketing this section of the stem with a glass lamp chimney. The plants were 
grown from seed sown on 5th March, 1919. 
(a) Two plants of green C. capsularis, two plants of red C. capsularis and two 
of red C. olitorius were infected on 27th June, 1919, at 10 a.m. The infections 
took upon the “ kakya bombai ,” producing a typical brown stain after 48 hours 
and ringing the stems by 10th July, 1919. Neither the red capswlaris nor the 
olttortvus Was injured. 
(6) Two plants of red C. capsularis and two of red C. olitorius were infected 
on 12th July, 1919, at 10 a.m. The infections upon red capsularis produced a 
brown stain on the stem in 48 hours; the progress of the inoculations was 
exactly the same as on green capsularis. No result was obtained on red C. 
olitorius. 
(c) Two plants of green C. capsularis, two of red C. capsularis and two of red 
Q. olitorius were infected on 15th July, 1919, at 10 a.m. In each case one plant 
was infected upon the uninjured stem surface and the other in the axil of a small 
lateral shoot. All infections upon green and red capsularis took at once and 
one plant of each variety was dead by 22nd July (Pl. VI, fig. 1). In the case of 
the infections upon C. olitorius that in the axil of a lateral shoot set up a typical 
rot but did not succeed in ringing the stem and killing the plant. 
Under the conditions of this experiment, therefore, the red C. olitorius 
seemed less easy to infect than either green or red C. capsularis. 
Experiment XV. In this experiment the plants moculated were growing in 
the field from seed sown on 5th March ; the infections were carried out upon the 
naked stem surface and were not jacketed in any way. 
