.6_ 



The insect is named from the spotted appearance of the mine on the 

 upper surface of the leaf v/here the chlorophyll is eaten in spots rather than 

 completely. A similar leaf miner eats out the chlorophyll in the mines com- 

 pletely and is called the Unspotted Tentiform Leafminer. 



The life history and seasonal history is very sketchily reported and 

 apparently they have not been completely studied. References state that the 

 moths emerge in the spring and the larvae pupate; in September, spending the 

 v;-inter in the mines in fallen leaves, all of which indicates one generation 

 annually. However, the iiife stations r eoeiitly observed definitely show 2, and 

 perhaps 3 generations this year. 



On August 11 to 13, moths were emerging and laying eggs for a genera- 

 ti')n T.'hich will develop in September and October. These moths "flew up" in 

 clouds from the heavily infested trees resembling a bad infestation of leaf- 

 hoppors in September, 



It is evident that the usual sprays of lead arsenate and sulfur have 

 little effect on these leafminors since v;ell-sprayed leaves were badly in- 

 fested, nicotine sulfate and probably other ovicidal sprays should be ef- 

 fective but they must be timed carefully and applied thoroughly. Theoret- 

 ically, 7 to 10 days after the moths emerge, at virhich time the larvae are 

 hatching and starting their mines, v^ill be the most effective time to spray. 

 Preliminary trials with nicotine sulfate and v/ith DIT-111 did not kill full 

 grovni larvae and pupae in the mines. 



- — W. D. V/hitoomb 



PRESENT STATUS OF APPLE LE.'iF-CURLIN G IIIDGE 



The Apple Leaf-Curling Ilidge is now generally spread throughout eastern 

 Massachusetts orchards. ITo practical control of this pest in commercial or- 

 chards by spraying has been discovered due principally to the necessity for 

 spraying the unfolding buds eacli 3 or 4 days during the egg laying period of 

 the midge flies and to the migration of flies from tree to tree and orchard 

 to orchard. 



Operations which v/ill reduce the abiindance of the insect and delay 

 its establishment in nev/ly infested orchards are: 



1. Spraying vrith oil emulsion or DN on the trunk and larger branches, 

 especially within loose bark, cavities and crotches at dormant or delayed 

 dormant application. 



2. Broadcasting naphthalene flakes at rate of 2 pounds per 100 square 

 feet under infested trees about blossom time. 



0. Cultivating under the trees about blossom time, 



4. Using nicotine sulfate in the calyx and 1st cover applications. 



5. Pulling and burning v/ater sprouts during July and August to kill the 

 second and third generation maggots. 



6. Pland picking of infested leaves, especially on grafts and small trees. 



\i. D. Vniitcomb 



