REVIEW OF FUSIFORM RUST INOCULATION TECHNIQUES 



343 



Table 1. Important factors 

 sporidia of C. fusi forme 



in the inoculation of pine with 



Infection process and 

 important factors 



Conditions 



Reference 



GERMINATION OF TELIA 



(a) age of telial column at 

 maximum spore production 



(b) optimum temperature 



(c) atmospheric moisture 



(d) time required for: 



(1) initiation of spori- 

 dial production at 

 optimum conditions 



(2) maximum sporidial 

 production at optimum 

 conditions 



(3) initiation of spori- 

 dial production at 

 sub -optimum 

 temperatures 



(4) maximum sporidial 

 production at sub- 

 optimum temperatures 



^ 2 weeks old Powers and Roncadori , 

 1966 



•x. 21°C Siggers, 1947 



> 97% R. H. Snow and Froelich, 1968 



4-12 hrs . Siggers, 1947; Kais , 



1963; Powers and Roncadori, 

 1966; Koenigs, 1968 



6-16 hrs. Powers and Roncadori, 

 depending on age 1966 

 of telial column 



* 1 1/2-14 hrs. Snow, 1968a 

 depending on 

 temperature and 

 preconditioning 

 treatments 



4-16 hrs. 

 depending on 

 temperature and 

 preconditioning 

 treatments 



Snow, 1968a 



GERMINATION OF SPORIDIA 



(a) direct: 



(1) optimum temperature 



(2) time required at 

 optimum conditions 



(b) indirect: 



temperature 



PENETRATION BY SPORIDIA 



22°C 



% 2 hrs 



occurs at 

 20-22°C 



Siggers, 1947 



Siggers, 1947 



Kais, 1963; Miller and 

 Roncadori, 1966 



time subsequent to 

 deposition required for 

 successful colonization 

 as judged by symptom 

 development 



a minimum of 4 Snow 

 hrs; % infection 

 increased with 

 time of "incu- 

 bation period"; 

 depending upon 

 post-deposition 

 treatment 



1968b 



