4 BULLETIN 1229, U. S. DEPARTMENT OF AGRICULTURE. 



whatever between the two hosts, in so far as occurrence of the dis- 

 ease was concerned. 



At various places along the shore line between Waldport and 

 Newport, Oreg., a distance of approximately 20 miles, the disease 

 was found on both Fragaria and Hypochaeris, both of which grew 

 in abundance. At times where the two plants were closely asso- 

 ciated both were found affected, and again one or the other or both 

 were free. In some spots either host growing by itself was affected 

 and at other times free from infection. In fact, infested areas were, 

 as a rule, in spots. The plants on one strip of considerable extent 

 might be 50 per cent and even occasionally 100 per cent infested, 

 while those on another strip a short distance away would be entirely 

 free or possibly less than 1 per cent affected. 



At Newport a search was made for the disease in several small 

 patches of cultivated strawberries within the town and in its suburbs. 

 No diseased plants were found, however, in spite of the fact that 

 Hypochaeris was found diseased quite frequently in strawberry 

 patches. In one case a diseased plant of Hypochaeris was found in 

 actual contact with the crown of a cultivated strawberry plant, 

 which itself was not affected. 



Likewise, in Tillamook and vicinity plants of Hypochaeris were 

 found affected. Cultivated strawberry fields were observed and ex- 

 amined carefully, but not a trace of the disease was found. Wild- 

 strawberry plants at this place, which is 5 miles from the coast, were 

 examined but found free from infection. 



Along the Tillamook Count} 7 beach the disease was found scatter - 

 ingly on the wild strawberry, in some places 75 per cent of the plants 

 being affected; in others, none or comparatively few. Hypochaeris 

 was also quite frequently diseased, some areas one-fourth of a mile 

 from the shore being found in which 75 per cent of the plants were 

 affected. Such spots were rare, however. In fact, many areas were 

 examined during the course of the surveys in which not a trace of 

 the disease was to be found. Here, too, occasional beds of cultivated 

 strawberries were observed and found to be free from the disease. 



In the vicinity of Seaside, Oreg., and thence northward it was 

 observed that the stem nematode occurred on Hypochaeris, but was 

 not to be found on Fragaria. Seaside is separated from the Tilla- 

 mook Beach region, Avhere the strawberry disease occurred abund- 

 antly, by a natural barrier consisting of a high promontory which 

 was heavily forested. For several miles this host does not grow. 

 This natural barrier may be an explanation for the absence of the 

 disease beyond. Between the Tillamook Beach and Seaside Hypo- 

 chaeris was rather rare, but such plants as were observed were free 

 from the disease. Great open meadows in which both Hypochaeris 

 and Fragaria ekiloensis grew abundantly occurred near Gearhart. 

 Many infested Hypochaeris plants were found here, but the Fragaria 

 was always free from the nematode. Along the edge of the golf 

 links at Gearhart a similar condition existed. Occasional diseased 

 Hypochaeris plants were likewise found at the branch agricultural 

 experiment station at Astoria, Oreg. Along the coast line north 

 and south of Long Beach, Wash., the disease was found in consider- 

 able abundance on Hypochaeris, but the wild sand strawberry was^ 

 entirely free from infection. Not a trace of the disease could be 





