42 



MASS. EXPERIMENT STATION BULLETIN 168. 



Table 19. — Effect of June Refioxo on Amount of Trichogramma 



Parasitism. 



Tests. 



ha 

 o o 



Q 



SI 



Wo 



o o c 



3 o e 

 2 



C3 03 

 3 0) 



A (four adjoining Onset bogs), 



B (adjoining Smalley bogs), 

 C (adjoining Hammond bogs), 

 D (adjoining woods pieces bogs), 

 E (adjoining Bumpus bogs), . 



Aug. 10 



Aug. 16 



Aug. 17 



Aug. 17 



Aug. 20 



Aug. 20 



Apr: 

 Apr: 

 Apr 

 Apr 

 Apr 

 Apr 

 Apr 

 Apr 

 Apr 

 Apr 

 Apr 

 Apr 

 Apr: 

 Apr; 

 Apr: 

 Apr 



115 



1 15 

 115 

 115 

 1 15 

 115 

 115 

 115 

 112 

 115 

 112 

 114 

 1 15 

 115 

 120 

 120 



Not reflowed. 



13th. 



15th. 



16th. 



Not reflowed. 



13th. 



15th. 



16th. 



Not reflowed. 



5th. 



Not reflowed. 



3d 



Not reflowed. 



4th. 



Not reflowed. 



4th. 



57 



20 



34 



40 



20 



25 



27 



9 



5 



8 



23 



14 



192 



63 



23 



70 



12.28 

 65.00 

 67.65 

 75.00 

 25.00 

 76.00 

 81.43 

 88.88 



87.50 



28.57 

 30.21 

 77.77 

 34.78 

 78.57 



Winter-flowed bogs that were not reflowed showed a much lower per- 

 centage of Trichogramma parasitism this season than did the strictly 

 dry bogs (without winter flowage), a condition which perhaps might be 

 expected. 



A single specimen of Megastigma brevicaudis Rat. ^ and six specimens of 

 an undetermined species of STjntomaspis ^ were obtained on July 2 and 3, 

 1907, from cans containing fruit worm pupa; in the cocoons. It is uncertain 

 whether these Chalcidids were primary or secondary parasites. 



In tests conducted the latter part of August, fruit worms fed freely on 

 the following kinds of fruit: swamp blueberries {Vaccinium corymbosum 

 L.), dangleberries (Gaylussacia frondosa (L.) T. and G.), black huckle- 

 berries {Gaylussacia baccata (Wang.) C. Koch), apples {Pyrus mains L.), 



1 Determined by Mr. A. A. Girault of the Bureau of Entomology of the United States De- 

 partment of Agriculture. The Synlomaspis species could not be identified definitely on account 

 of the present chaotic condition of the genus. 



