858 EXPERIMENT STATION EECORD. 



a bog to any extent, when it is reflowed with quiclv retlowago (i. e.. quiclily 

 put on) 2 or 3 times regnlai-ly after May 25, and if it does get in it never stays 

 long, whatever the condition of the vines." 



In further worlc witli tlie fruit worm, it was found that 4 lbs. of resin fish 

 oil soap to 50 gal. of water used in conjunction with Bordeaux mixture and 

 Paris green causes trouble by clogging the valves of the spray pump. Thus 

 it is recommended that the amount be reduced to 2 lbs. to 50 gal. of water, the 

 formula to consist of stone lime 5 lbs., copper sulphate 2i lbs., resin fish oil 

 soap 2 lbs., Paris green 1 lb., and water 50 gal. 



Work with parasites of the fruit worm was eomiueuced during the year. 



Heavy fall and spring sanding for the girdler (Cnimhus JiortiicUus), where 

 reflowing could not be done after picking, has in some eases proved successful, 

 while in others it failed to give satisfaction, the failure in every case observed 

 being due to the fact that the sand was not applied evenly over the infested bog. 

 Two new cranberry insect pests, one a scale somewhat similar in appearance to 

 the San Jose, the other the larva of a June beetle, were found to cause con- 

 siderable injury in some places on cranberry bogs. 



Quite extensive obsex'vations and experiments were made on the fertilization 

 of the blossoms of the cranberry with a view to discovering the important 

 agents in cross pollination and the determination of the value of the honeybee. 

 In conducting this study 3 tents of mosquito netting were erected on the bog. 

 The season's experience is said to confirm the conclusions of the previous year, 

 namely, that it will often pay to keep hive bees near cranberry bogs during the 

 blooming season. 



Insects injurious to citrus fruits and methods for combating them, W. V. 

 Tower (Porto Rico Sta. Bui. 10, Spanish Ed., pp. 36, pis. 5). — This is a Spanish 

 edition of the bulletin previously noted (E. S. R., 25, p. 253). 



California redwood attacked by Termes lucifug'us, W. B. Parker (Jour. 

 Econ. Ent.. Jf (1911), No. 5, pp. 1/22, Jj23). — The work of these insects upon the 

 string pegs and trellis iwles in the hop yards near Sacramento shows that under 

 some circumstances, at least, this wood is subject to attack by T. lucifugus. 



A true internal parasite of Thysanoptera, H. M. Russell (Proc. Ent. Sof. 

 Wash., 13 (1911), No. k, PP- 235-238) .—The author records the rearing of the 

 parasite Thripoctenus russelU from Heliothrips fasciatus, Thrips tctbaci, and 

 Euthrips tritici in Los Angeles County, Cal. 



" This parasitism first becomes evident 2 or 3 days after the thrips larvte have 

 changed to the prepupal stage and often after the normal insects have further 

 changed to the pupal stage. . . . The parasitic larvje emerge and pupate within 

 from 2 to 11 days after the parasitism becomes evident, but, in over 66 per cent 

 of the cases observed, in from 3 to 4 days. . . . During the summer the pupal 

 stage varied in length from 16 to 28 days, but over 66 per cent of the speci- 

 mens reared completed this stage in from 17 to 20 days. . . . Field collections 

 this past summer (1911) have shown it to be breeding extensively in the onion 

 thrips and bean thrips (Heliothrips fasciatus), the parasitism in some cases 

 running as high as 70 per cent. The gi-eatest number of adults reared from the 

 eggs deposited by a single female so far has been 91 siiecimens. 



" The time from the laying of the egg until the parasitism is indicated in the 

 host prepupa varies from 6 to 15 days, but is 7 days in the greater number of 

 cases. The time required from oviposition to the pupation of the parasite varies 

 from 8 days in the case of a very few, to 24 days in a few cases, but over 56 per 

 cent change in from 10 to 14 days. The whole life cycle, then, requires from 28 

 to 48 days, with a mean average temperature of about 65° F. The winter is 

 undoubtedly passed in the pupa stage, but the writer hopes to settle this point 

 definitely during the coming winter. At present this parasite is known to occur 



