l-T.M.I PARASITIC l'P().\ A I.K YK< >I>KS CITRI. 



an 'nfested tree a short piece of .wood whose bark bears a good supply of 

 the fungus. This has proved to be a very effective way of distributing this 

 fungus, and has already saved thousands of dollars to the peach and orange 

 growers of the State. In addition to attacking Aspidiotns perniciosus and 

 . Ispidiotus ohscurus, this fungus is effective in checking a number of other 

 scale insects in Florida. It is, under favorable moisture conditions, an 

 effectual parasite of Mytilaspis citricola, Mytilaspis gloi'erii, Aspidiotus 

 ficus, .Ispidiotirs hciicrac and Parlatoria pergandii. There are times, in dry 

 weather, when these scale insects get ahead of the fungus ; but a moist 

 period of a few days will quite often enable the fungus ro kill them off 

 almost completely. (Plate VI, Figs. 3(5, 37 and 38.) 



The effective work of this fungus, and two others, Ophionectria coc- 

 cicola E. & E.. and Myriangwm dttriaei Mont, upon the orange scales, is 

 readily shown by spraying an orange tree very thoroughly with Bordeaux 

 mixture. During the summer and fall of 1907, the author sprayed a num- 

 ber of orange trees with Bordeaux mixture for another purpose. The trees 

 were sprayed very thoroughly, once in May, once in July, and once in 

 September. Before the first spraying, the trees were practically unhurt by 

 Mytihispis citricola, only a few individuals of this scale being found on any 

 part of the trees. After the first spraying this scale insect began to spread, 

 and increased slowly in numbers until November, when the trees were badly 

 attacked by the scale. Other trees near by, that had received no spray, were 

 as free from scale as at the first. The fungicide had evidently destroyed, 

 on the sprayed trees, the fungi that had been all along working upon the 

 unspraved trees. 



Soon after the discover}- of this fungus in Florida by P. H. Rolfs, ex- 

 periments were made by S. A. Forbes 51 of the Illinois Experiment Station, 

 Ii. Smith-" 1 - of the Xe\v Jersey Experiment Station, J. Craig 5 -' 5 of the 

 Canadian Experiment Station, and F. A I. Webster"' 1 of the Ohio Experi- 

 ment Station, to introduce Sphacrostilbc coccophila on San Jose scale in 

 the Xorth. hut the climate of these States did not prove to be conducive 

 to its spread, and the work was abandoned. 



I'll II, A AS A PA HAS IT K o|- AI.I-VK )1)|-S CITKI. 



As was stated previously. Spluicrostilhc coccophila seems to have been 

 first reported as parasitic on .llcyrodcs citri in 1!M)3 by H. A. Gossard. It 

 was f<und on larvae of .llcymdcs citri on orange leaves received from Or- 

 lando. In 1!Hi:,. K. II. Sellanls" 1 " 1 al.so reported having received it from 



" 111. Kxp. Sta. I'.ul. :,('.. pp. 270 280 



J. Kxp St.-.. Kept, is. ,, p . IT., 179, 1897. Kept. P.I. pp. 145-446. l.s'.is. Rept 24 n 



"Canada Kxp. I-V.nn Ki-pt.. p. 11'.'. Lfi 

 1 ( )iii.. Kxp. Sta. I'.ul. in:;, p. p.is. [898, 

 " Kla. Kxp. Sta. Rt-pt . p. 87, L905. 



