under surface of the leaves, and the disease may often 

 prove I b very destructive if it is allowed to go on 

 un< ed. 



The disease has been recorded in the United States of 

 America and in Japan. 



Spraying with dilute Bordeaux mixture or with a solution 



liver oi sulphur" is an effective remedy. 



Dt Forming very delicate patches on the under 



surf... the leaf white; conidiophores dichotomously 



branched, ultimate branches acute, straight, spreading ; 



nidia hyaline, elliptical, 25-32 by [8-20 microns. 



M Text Book of PL Dis.,p. So, 1907. 



Berk, and Curt. : Journ Linn. Soc. Vol. X., p. 363. 



PERONOSPORA HYOSCYAMI, De Bary. 



(Tobacco Mildew). 



The fungus is a destructive parasite on cultivated 

 tobacco in Queensland ; it has also been reported from 

 California. 



Spraying with dilute Bordeaux mixture has been found 

 to be effective in checking the spread of the disease. 



Diagnosis: Forming dirty, greyish-violet tufts on the 

 under surface of the leaf ; conidiophores 300-500 microns 

 high, 5-8 times dichotomously branched near the apex, 

 ultimate branches diverging, short and awl-shaped ; conidia 

 small, elliptical, ends obtuse, pale dingy-violet, i5-24by 13-18 

 microns ; oospore unknown. 



Ma.->si e : Text Book of PL Dis. p. 81, 1907. 



De Bary : Ann. Nat. Sci. Vol. XX., p. 123. 



PYTHIUM PALMIVORUM, Butler. 

 (Bud Rot of Coconut.) 



In addition to the coconut the fungus also causes a 

 disease of palmyra and areca palms in India. 



The first symptom is the turning white of a whole 

 leaf situated usually near the centre of the " crown." 

 Next, the unopened leaf in the centre of the " crown " 

 becomes likewise discoloured. Finally, the central shoot 

 rots and the whole crown falls. When a plant is once 

 attacked it rarely recovers. 



Butler : Memoirs of the Pusa Institute, Bull. No. 9, 

 1908. 



16 



