117 



3. Egg Plant. — -At Godfrey, September 25, the leaves of egg 

 plants were found badly riddled by a small flea beetle, Crcpidodera 

 cucumeris, Harris. 



4. Larch. — In June, the foliage of the larches in the grounds of 

 the University at Normal, were seriously affected by the red spider 

 {Tetranychm telarius, L.,) some of the trees seeming likely to die. 

 On one of those worst infested we tried the effect of spraying with 

 a kerosene emulsion made with soap, and diluted to contain two 

 and a half per cent, of kerosene. The insects were greatly reduced 

 in number by a single application, but not ail killed. The trees soon 

 revived appreciably as compared with those not treated. 



5. Willow. — The leaves of the willow at Normal were generally 

 infested both in 1883 and 1884, by the larvae of Ajxitela ohlinita, 

 those collected July 6 pupating on the 11th and emerging on the 

 •29th. 



Orgyia lencostigma, Smith, was rather abundant on the willow in 

 the University grounds at Normal. 



Larvse of Plagiodera lapponica, L., taken on the willow at Normal, 

 June 24, commenced to pupate July 1, and to emerge on the 3d, 

 the last of about sixty appearing on the 8th. 



The adult, Crepldodera helxines, L., was found repeatedly through- 

 out May in Central and Southeastern Illinois, devouring the leaves 

 of willows, and scarcely less commonly upon the Lombardy poplar 

 and the balm of Gilead, doing decided injury to young trees in the 

 nurseries. 



6. Cherry. — From my friend, Dr. E. K. Boardman, of Elmira, 

 Stark county, I learned on the 9th June that the common willow 

 slug (Nematus ventraUs, Say) had almost completely defoliated a fine 

 tree of wild cherry on his grounds. The species has long been 

 known as an enemy of the willow, but has not been heretofore re- 

 ported as injurious to any fruit tree. 



During this month of June the cherry slug {Seknulria rerasi, Peck) 

 was especially abundant, completely whitening the leaves of many 

 trees, and doubtless killing some. The efficacy of hellebore for the 

 destruction of this insect is weU known, but as the use of so poi- 

 sonous a substance is often unadvisable, we experimented somewhat 

 carefully with two other insecticides — the kerosene emulsion and 

 pyrethrum, a five per cent, dilution of the former, containing two 

 and a half per cent, of kerosene, and one ounce to a gallon of the 

 latter. We found these in both cases entirely effective, only a small 

 percentage of the larvfe treated escaping. 



7. Currant and Gooseberry. — The green apple leaf hopper {Empoa 

 albopicta, Forbes,) was seen by us upon the currant and gooseberry 

 at Normal, in numbers sufficient to^ do serious injury, causing the 

 leaves to curl and shrivel. 



A number of leaf rollers of the currant, collected at Normal on 

 the 12th May, — white, smooth, with shining jet black head, mouth 

 parts, and cervical shield, prothoracic segment except the shield 

 reddish with two oblong black tubercles upon the sides of this seg- 

 ment, the anterior legs black, tarsi of the others dusky, — emerged 



