April, 1906.] Ascoehyta pisi — Disease of Seed Peas. 



511 



the least on the sprayed crop. Though the sprayed rows and 

 those tied up, produced, in general, more than the checks, the 

 gain was scarcely sufficient to warrant such treatment merely 

 to increase the quantity of peas. The object, however, of such 

 treatment, is more for the purpose of growing uninfected seed 

 peas in order that so great loss may not be experienced from a 

 poor stand and to start a crop free from the disease. This, on 

 soil free from the disease, ought to improve the situation. Al- 

 though a test of the per cent, of germination of the 1905 seed has 

 not yet been completed, the seed from tied up and from sprayed 

 peas, was much freer from the fungus than that from the check 

 lots. Notwithstanding the great care in spraying, the results 

 are certainly not what they would be under more favorable 

 conditions of weather. The almost daily rains rendered it im- 

 possible to keep a coat of Bordeaux on the plants. 



TABLE II. 



* No late planting made, f Gain. J Loss. 



The early training up of peas seems to be an important factor 

 in securing healthy seed peas, since the fungus makes its first 

 attacks near the ground and gradually works itself up the stem, 

 branches and leaves. The height (on the plant) to which the 

 fungus will attain in a given time, is therefore dependent, to a 

 certain extent, upon how much of the vine lies upon the ground. 



Hosts. — All the varieties of the common pea examined dur- 

 ing the past year, were found to be affected with Ascoehyta, 

 though some much more seriously than others. 



The following is a list of those carefully examined: 



French Jvme Very badly. Prosperity Badly. 



Market Garden " " Ainerican Wonder . . .Very badly. 



Admiral Badly. Advancer Badly. 



Dwarf Telephone. . . . Very badly. Alaska SHghtly. 



Telephone Badly. 



So far as the writer is able to learn, no investigations have 

 been made as to the susceptibility of varieties. Aside from the 

 genus Pisunt however, it has been found to attack Medicago 

 sativum^\ Cicer arietinum,^'' Phaseolus vulgaris^'^ and Vicia vil- 

 li . Lagerheim, Bihang till K. Svenska Vet.— Akad. Handlingar. 1898. Bd. XXIV 

 Afd. Ill, No. 4, 21p. 



12. Rostrup, "Tidskrift for Landrugets Planteavl" V, No. 14, Kjobenhavn 1898. 



13. Carruthers, Jour. Roy. Agr. Soc, Eng, Ser. 10 (1899) pts. 4,.678-688, 



