421 



The snowy tree-cricket. — An illustrated accoimt of Occanthus nivens, 

 which caused injuries to the canes of black raspberries, as reported to 

 the station : 



This iusect is very subject to the attacks of parasites. Fioin a Kiiij;le up^t Croiu 

 which wo bred only sixteen moths there emerged eighty-seven IchniMimon Hies. It 

 is evident that in this case the majority of the larvie were destroyed by the parasites. 

 Tliis is probably the reason that the species is kept tolerably well in check in most 

 parts of the country. 



In case this insect lieconies destructively abuuihint, it can be easily clicked by 

 cutting out the nosts and burning them before the moths emerg<i. As the insects 

 reach maturity in July, some of them early in that nmnth, the destruction of the 

 nests should be made uot later than the last of June. 



The cherry-tree scallop-Hhell moth. — An illustrated account of this 

 insect, from specimens bred in the insectary of the station. The larva 

 is described in detail. Chalcid and braconid flies were found to be 

 parasites destructive to llydria uudulata. 



Notwithstanding the number and activity of its little foes, this cherry-tree pest 

 {Hydria undttlata) has become no numerous in a grove of small trees, mostly wild 

 cherrj', near the insectary that dtiring the past summer the beauty of many of the 

 cherry-trees was seriously marreil and their growth no doubt considerably checked. 

 Tlie remedy is simple and easily applied. Our experiments in the insectary, supple- 

 mented by field observations, indicate tluit the insect is single biooded in this State, 

 and t hat most of tht) larva>. leave the nest during the month of September, so that if 

 the branches containing the nests be cut oft" and burned prior to September 1, the 

 pest will soon be exterminated. 



A leaf roller on the currant. — An illustrated account of the life history 

 of Gacceciarosana, from specimens bred in the insectary of the station. 



The eggs hatched during tiie last days of April (27-28). Some of the larv;e had 

 reached the last larval stage by the middle of May, while others were not more 

 than half grown at this time. The first i)upa was observed May 22, and within a 

 week all of the larvse had transformed to pupaj. The moths began to emerge June 3. 



Eggs were not obtained from the moths that we bred, consecjuently only one gen- 

 eration was observed. It is probable, however, that there are two or more broods 

 each season. The time at which the eggs were found shows that the species passes 

 the winter in this form. 



New York Cornell Station, Bulletin No. 24, December, 1890 (pp. 13). 



The clover rust, J. K. Uowell (pp. 129-139, illustrated). ^Atten- 

 tion is called at the outset to the dilierence between clover rust ( Uromy- 

 ces trifolii) and two other minor diseases of red and white clovers, 

 rhyllachora trifolii and Fhacidiuin trifolii. " Both of the latter pro- 

 duce black, smoothish discolorations, chiefly of the leaves; while the 

 true 'clover rust' infests the leaves, the leaf stalk, or petioles, and the 

 stems. In appearance the spots of the rust proper are oblong, well 

 defined, brown in color, and somewhat powdery on the surface. The 

 disease has not been long known in Ainer'ca, but has prevailed to such 

 an extent during the several wet, cool seasons preceding 1890, in many 

 sections of the Kortheru States, that it m ist bo regarded as a disease 



