. Bulletin of the Department of Agriculture. Agriculture. 88 BULLETIN 536, U. S. DEPARTMENT OF AGRICULTURE. DlACHASMA TRYONI CAMERON. Diachasma tryoni Cameron (Plate XXI, fig. 2) is primarily a para- site of the Queensland fruit fly (Bactrocera tryoni) and was first reared by Brooks and Gurney in New South Wales during 1908, and described as a new species by Cameron in 1911. Of 1,575 pupae of Bactrocera tryoni secured by Gurney from 18 different lots of fruits during the period from January, 1910, to February, 1911, per cent were parasitized; the highest percentage of parasitized bei
. Bulletin of the Department of Agriculture. Agriculture. 88 BULLETIN 536, U. S. DEPARTMENT OF AGRICULTURE. DlACHASMA TRYONI CAMERON. Diachasma tryoni Cameron (Plate XXI, fig. 2) is primarily a para- site of the Queensland fruit fly (Bactrocera tryoni) and was first reared by Brooks and Gurney in New South Wales during 1908, and described as a new species by Cameron in 1911. Of 1,575 pupae of Bactrocera tryoni secured by Gurney from 18 different lots of fruits during the period from January, 1910, to February, 1911, per cent were parasitized; the highest percentage of parasitized being per cent of 136 pupae secured at Narara during February, 1910. During April, 1913, at Gosford the parasitism equaled 70 per cent. While Diachasma tryoni in Australia attacks principally the Queensland fruit fly, it has been definitely reared there from Ceratitis capitata under field conditions, and the indications are strong that it may attack also the island fruit fly, Trypeta musae Frogg. It was the opinion of Gurney that this parasite might, upon occasion, become a valuable check upon C. capitata. While en route to Honolulu from West Africa, Silvestri, aided by Gurney, secured pupae of Dacus tryoni in New South Wales. From these pupae Silvestri reared adults of Diachasma tryoni, of which he succeeded in introducing at Honolulu 4 female and 3 male specimens on May 16, 1913. Silvestri soon found in his rearing experiments in Honolulu that the progeny were largely of the male sex, hence 4 females, with males, were liber- ated June 12 in the Kona coffee district of Hawaii, 3 females, with males, on July 4 at Waianae, and 9 females, with males, on July 11 in Kona, Hawaii. As all the progeny of the remainder of the material held at the insectary were males, the specimens of this parasite now in Hawaii are the progeny of 24 females liberated during June and July, 1913. The first recovery of Diachasma tryoni was made by Ehrhorn during August, 1914, from C. capitata pupae fro
Size: 1062px × 2353px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectagriculture, bookyear
