80 CEOWN-GALL OF PLANTS. 



QUINCE ON SUGAR BEET. 



Inoculations of February 26, 1909 (Brown). 



Seven small sugar beets were inoculated just below the surface 

 of the ground with 3-day-old agar streak cultures, the second sub- 

 culture from the poured-plate colonies. Two checks were made. 



Result. — March 31, 1909: No growth of the beets had taken place 

 since the time of inoculation and no outgrowths were found, either 

 on the inoculated plants or on the checks. The absence of galls 

 should be ascribed probably either to a defective culture or to 

 slow development of the beets rather than to any special resistance. 



Inoculations of July 2, 1910 (Brown). 



Four inoculations were made on middle-sized plants, and 12 on 

 younger plants growing in a bed. All were made on the upper 

 part of the root by needle pricks, using young agar cultures. 



Result. — July 18, 1910: All negative. Here again the plants were 

 making a very slow growth, owing to the excessive heat. Whether 

 this second failure should be ascribed to the bad condition of the 

 host plants or to the character of the culture must be left an unset- 

 tled point. Its cultural characters were unlike those of the cultures 

 of proved pathogenic power (daisy, hop, peach, grape, poplar). 



BEET ON DAISY. 



Inoculations of April 26, 1910 (Brown). 



Four terminal shoots were inoculated on old slow-growing daisy 

 plants already bearing daisy galls on the main stem. A 4-day-old 

 culture of an organism from the sugar beet on agar was used, and this 

 was inserted by needle pricks. 



Result. — June 25, 1910: Three shoots negative. The fourth bears 

 in the pricked part one small gall about as large as a sweet-pea seed. 



BEET ON ALMOND. 



Inoculations op July 30, 1910 (Brown). 



These almonds were part of the lot used for the grape inoculations 

 of 1910, i. e., young grafted stocks. Four plants were inoculated by 

 needle pricks and 2 were held as checks. 



Result. — October 22, 1910: All negative. 



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