April, '08] JOURNAL OF ECONOMIC ENTOMOLOGY 153 



that they had eaten up 110 acres of alfalfa in three days and were also 

 eating his cotton plants. 



The present year has also brought the destructive pea aphis to the 

 attention of the writers for the first time. In April complaints were 

 received from St. Bernard Parish that the cowpea and onion crops 

 were entirely destroyed by insects. The aphis responsible for destruc- 

 tion of the peas was identified by Prof. E. D. Sanderson as Nectar- 

 ophora pisi Kalt., while the onion enemy proved to be the onion thrips, 

 Thrips tabaci Lind. 



The Colorado potato beetle, Leptinotarsa decimlineata Say, is not 

 generally injurious in this state, although it sometimes does damage 

 locally. It is more important in the northern part of the state than 

 in the southern ; in fact, is seldom seen in the coast region. 



Sweet potato culture in southern Louisiana has been made almost 

 impossible by the sweet potato borer, Cylas formicarius Fab., which is 

 rapidly becoming one of our most injurious insects. The habits of this 

 pest make it a very difficult one to control in the field, although fumi- 

 gation seems fairly effective in protecting the stored tubers. 



The cabbage enemies are the usual Harlequin cabbagebug, Mur- 

 gantia histrionica Hahn., and the imported cabbageworm, Pontia rapae 

 Sch. 



Insects Affecting Deciduous Fruits 



Among the Coccids which are more or less injurious to deciduous 

 fruit trees and nursery stock are the San Jose scale, Aspidiotus 

 perniciosus Comst., Putnam's scale, Aspidiotus ancylus Putn., cherry 

 scale, A. forhesi Johnson, English walnut scale, A. junglans-regiae 

 Comst., European fruit scale, A. ostreaeformis Curt., and the terra- 

 pin scale, Eulecanium nigrof asciatum Perg. With the exception of 

 perniciosus, the species of Aspidiotus are important principally on 

 account of their occurrence on nursery stock, although a few orchard 

 trees have been found very badly infested with A. forhesi. 



A. perniciosus is widely scattered over the state, being established 

 in practically every section where any large number of peach trees 

 are grown. On account of the long breeding season in Louisiana, 

 this insect multiplies much more rapidly than in the northern states. 

 Young larvas have been observed in every month of the year. 



Another Coccid which has been injurious in a few instances in the 

 southern part of the state is the West Indian peach-scale, Aulacaspis 

 pentagona Targ. The state nursery regulations require that this in- 

 sect be dealt with in the same manner as San Jose scale, when found 

 in or near a nursery. 



