W, MCHAE 

 Cross inoculation of fruits of Hevea. 



257 



D, discoloration on surface. H, hyphie on surface. S, sporangia produced. 



On Hevea fruits the discoloration caused by P. Meadii rapidly became dark 

 dull green and then a dirty, greyish gieen, while that caused by P. Faberi 

 progressed more slowly to the same result. When the former had assumed an 

 ashy grey appearance, the latter had still their natmal gieen, and it took about 

 two days longer to discolour them thoroughly. The mycehum of P. Faberi 

 grew along the surface of the Hevea fruits for a distance of about two centimeties 

 while that of P. Meadii did not. Hyphse of P. Meadii emerged on the 

 discolom-ed surface a day before those of P. Faberi, and were much more copious 

 afterwards. Resting conidia of P. Faberi were always associated with sporanoia 

 in about equal numbers. On the 5th day a small spot of mycelium of a Fusarium 

 appeared on two Hevea fruits in the check-dish, and on the next t-^o days on 

 each of other two fruits, while the bruised check-fruits remained unchanged 

 till the 8th day, when a small spot of Fusarium appeared on one. The surface 

 became discoloured in a way somewhat similar to that when Phjto2)hthora ■\\as 

 present, but it progressed much more slowly. That the two Phytojihthorus 

 caused the discoloration, the test showed clearly however. Both P. Meadii 

 and P. Faberi infected all the Hevea fruits. 



Unbruised cacao fruits did not become infected with P. Meadii after 

 20 days. The inoculative material was tested by removing it from the fruits 

 on the 14th, 17th and 20th days respectively, and placing it in distilled w ater 

 and in culture media. Li each case the fungus w as alive, and readily produced 

 sporangia and discharged zoospores. The tissue of the fiuit was not 



