JEHANGIR FARDUNJI DASTUR 223 



haemoglobin. The growth of the fungus was inclined to be confined to the 

 surface of the medium. Hardly any sporangia were formed but resting conidia 

 were produced in large numbers. 



To glucose meat-extract agar were added traces of haemoglobin, potas- 

 sium phosphato, and calcium nitrate. The growth of the fungus in this medium 

 was similar to that in glucose meat-extract agar. Hardly any sporangia 

 and a few resting conidia were produced. 



In hor.^e dung agar the growth was very scanty and entirely submerged. 

 Sporangia were produced in large numbers but resting conidia very few. In 

 horse dung solution the growth was very poor. Sporangia were fairly many 

 but resting conidia very few. 



On steiilized potato cylinders the aerial growth is very little ; at first the 

 mycelium remains closely appressed to the surface of the cylinder. Ftcsiing 

 conidia are produced in large numbers but sporangia very few. 



On sterilized pods of green peas the fungus grows very well. There is a 

 good aerial growth. Resting conidia are developed in large numbers ; 

 sporangia very few. 



On sterilized ants the fungus did not grow. 



In culture media this fungus does not produce the stroma-like bodies 

 which it forms on fruits. 



Comparison between the phytophtuora disease of hevea in burma 



AND in other J?£F^^-GR0WING COUNTRIES. 



In Ceylon Hevea canker was investigated in 1903 by Carruthers^ and 

 was supposed to be causedby a iVedm, Petch^ in 1910 inoculated ten Z^erm 

 stems with Phyto'phthora spores obtained from diseased cacao fruits and three 

 more by inserting in wounds pieces of diseased cacao pods. Six out of these 

 thirteen inoculations gave definite infections and therefore he concluded that 

 canker and pod disease of Hevea are caused by the same Phytophihora 

 which is responsible for the stem canker and pod rot of cacao, viz., Ph. 

 Faberi Maub. 



According to Petch^ who has studied Hevea canker in Ceylon under 

 field conditions in great detail, Ph. Faberi, the accepted cause of canker, 



1 CaiTuthers, J. B. Canker (Neciria) of Para Rubber (Hevea Brasiliensis). Circs. & Agr. 

 Jour. Roy. Bot. Gard., Ceylon, II, No. 29, 1905, p. 445. 



2 Fetch, T. Cacao and Hevea Canker. Circs. & Agr. Jour. Roy. Bot. Card., Ceylon, V, 

 No. 13, 1910, p. 159. 



8 Fetch, T. The Fhysiology and Disease of Hevea Brasilie^isut, 1911, pp. 199—201. 



