New York Agricultural Experiment Station. 603 



The treated stock made aii average growth of from two to three 

 feet, with only a few cnrled leaves at the base of the new growth. 



The latter part of June a " Green Plant louse " {Sij)honophora 

 Sp. ?) was noticed in large numbers on "Pigweed" {Chenopodnim 

 alh(?n). On July Stli the same louse was noticed on potatoes and 

 tomatoes. By July 15th they had increased in such numbers that 

 complaints of their injury commenced to come in. The latter part 

 of July they were found feeding on cucumber and squash vines, 

 and on " Shepherd's Purse" or ''Pepper Grass." I mistrust that 

 this Aphid will prove to be identical with the "Rose Aphis" 

 {Si]}honopJiora rosce). Emulsions made of crude petroleum, also of 

 the light and heavy oils of crude petroleum, diluted with sixteen 

 parts water to one part of the emulsion, were tested on this Aphid 

 on tomato plants. About 75 per cent, of the Aphids were killed 

 and all the plants were injured. 



Besides the "Green fly" {Bhopalosiphum dianthi) two other 

 species of plant lice are quite common and do considerable damage 

 in neglected green houses. (The "Green fly" usually infests the 

 carnations.) The " Dark-brown Chrysanthum fly " {Sij^honojyhora 

 Artimesia? Buckton) occurs on "Wormwood" or "Mugwort" 

 {Artimesia vulgaris) in the fields and migrates from this to the chrys- 

 anthemums before the latter are taken into the greenhouse. In the 

 field they usually feed on the under side of the leaves, thus are not 

 noticed. About the time the chrysanthemums begin to open their 

 flower buds the flies move to the flower stalk, at which time they 

 are very conspicuous as well as injurious. 



Another species, Siphonophora circwmflexa^ attacks calla lilies, 

 Cyclamens, " Dusty Miller" {Senecio cineraria) and Spiraxis. It 

 caused the most noticeble injury to the flower of the calla ; an in- 

 jury for which there is less excuse than for the injury done by any 

 other plant louse known to infest greenhouses. The calla is an easy 

 plant to wash before the flowers open ; all parts of the plant can be 

 reached by any method by which the washes are applied. Hence it 

 is carelessness to allow this pest to increase until the flowers are 

 open. As soon as the flowers open the plant lice crowd into them 

 and in a short time make them filthy. A soot-like mould soon be- 

 gins to grow on the flowers where these pests work. 



Sekd-stalk "Weevil. A seed-stalk weevil of kale, cabbage and tur- 

 nip did considerable damage to the above named plants in the seed- 

 growing section of the island, especially at Cutchogue. This prob- 



