EXPERIMENT STATION REPOET. 539 



PEAR PSYLLA. 



Pear Psylla has not been much noticed of late years, but was found 

 in some Keiffer orchards in Cumberland county this summer in harm- 

 ful numbers. Late in September I found larval 

 and pupal forms, as well as adults, and the owner 

 of the orchard informed me that his fruit had 

 been materially checked by the attacks of the in- 

 sects. This particular orchard had never been 

 winter-sprayed, and I advised the soluble oil in 

 late fall. Some orchards in the same general 

 region that were in the past injured by the Psylla 

 have been free from the pest since winter spray- 

 ing for scale has become necessary. That is Fig. 9, 

 particularly true of those cases where crude petro- '^^® ^®*' P^yUa. 



. Greatly en- 



leum has been applied. larged. 



ROOT MAGGOTS. 



Cabbage, cauliflower, radishes and onions suffer more or less each 

 3^ear from the attacks of root maggots — the first and last most severely. 

 It happens, sometimes, that a season, or even several seasons, go h\ 

 without much injury, and such period of exemption may be followed 

 by a season or seasons of severe damage, when the insects seem to 

 increase to such an extent as almost to prohibit the growth of the 

 crop. On radishes the injury is usually slight, because the crop is 

 quickly grown and quickly out of the way, so that only the first 

 brood, from the hibernating females, can cause trouble. On cabbages 

 the matter is more serious because of the longer period during which 

 they are subject to attack, but cabbage-growers generally have learned 

 how to deal with the insects by repellants, by fertilizers, by the appli- 

 cation of insecticides or by using protective coverings. Not very much 

 complaint of this particular species has been made of late. 



The onion maggot has been most complained of during the two 

 seasons last past, and from all parts of the State. Whatever the 

 reason, complaints in pasi; years have come mainly from the southern 

 counties, but now all onion-growing sections are equally infested. 



As against this kind of attack our remedial measures leave much 

 to be desired ; but for the information of the grower a brief life history 

 of the species, with some account of its habits and the methods of 

 dealing with it, is given on another page of this report. 



