34 



Davis (J. J.)- Co-operation among Agricultural Workers. — Jl. Econ. 

 Entom., Concord, N.H., xi, no. 5, October 1918, pp. 406-410, 



The author emphasises the need for workers in all branches of 

 agriculture to keep in close touch with one another, and for the 

 maintenance of a free exchange of ideas and plans between agronomists, 

 entomologists, plant pathologists, chemists, foresters, animal husband- 

 men, meteorologists and others. He cites the familiar instances of 

 the value of such co-operation in the investigations on the Hessian fly 

 [Mayetiola destructor] and white grubs (Lachnosterna). 



Back (E. A.). Clytus devastator, a new Pest of the Florida Orange, 

 — Jl. Econ. Entom., Concord, N.H., xi, no. 5, October 1918, 

 pp. 411-414, 1 plate. 



The Cerambycid borer, Clytus devastator, was first described as a 

 serious pest of Citrus in Cuba in 1836, and has since been recorded 

 on the coasts of Florida. It has been reared from Cuban mahogany, 

 pomegranate {Punica granatum), and orange {Citrus), and is reported 

 to have as its preferred host the common mangrove {Rhizophora 

 mangle). Apart from the original statement that it was a serious 

 pest of Citrus in Cuba, it had not been reared from Citrus until it was 

 found damaging orange trees on Perico Island, Florida, in the spring 

 of 1910. The damage done by it closely resembles that due to Cyllene 

 robiniae (black locust borer). 



The larvae, when young, feed upon the inner bark and sapwood, 

 and later bore into the harder and older wood, not only of various 

 parts of the trunk, but also of the bases of the larger branches, and of 

 the roots, both large and small. The mature larva has the habit, 

 similar to that of Sajperda Candida (round-headed apple-tree borer), 

 of eating its way to the surface, after which it retreats a short distance 

 from the bark to pupate. The adult, on emergence, gnaws a hole 

 about f to I inch in diameter in the bark and escapes. 



With the extension of the citrus industry into more tropical portions 

 of the State, this beetle may assume an important role as a pest of 

 Citrus. 



Flint (W, P.). Insect Enemies of the Chinch-bug. — Jl. Econ. Entom., 

 Concord, N.H., xi, no, 5, October 1918, pp, 415-419. 



Very little study had been given to the predaceous or parasitic 

 insect enemies of the chinch-bug [Blissus leucopterus] up to the time 

 of the discovery of its egg-parasite, Eumicrosoma henefica, Gahan, 

 in 1913. Among its earliest recorded enemies are a Coccinellid, 

 Hippodamia maculata ; a lace- wing, Chrysopa illinoiensis ; bugs : 

 Triphleps insidiosus, Milyas cinctus, and Nysius angustatus (false 

 chinch-bug) ; ground beetles : Agonoderus pallipes, Harpalus compar, 

 Euarthrus sodalis, and Anisodactylus harpaloides ', and ants : Solenopsis 

 molesta and Monomorium minimum, which carry off the eggs and 

 dead adults. 



During the outbreak in Illinois in 1909-1915, experiments were 

 made with its commonest predaceous enemies, including : — Chrysopa 

 oculata and C. rujUahris, the larvae of which were abundant in all 

 fields of grain infested by the chinch-bug, and in the laboratory 



