. Elementary entomology. Insects. 250 ELEMENTARY ENTOMOLOGY and we are just commencing to learn how to utilize them in com- bating imported insects. Thus the state of Massachusetts and the United States Bureau of Entomology are now carrying on ex- tensive experiments in the importation of the parasites of the gypsy and brown-tail moths, which are very largely effective in holding those insects in control in Europe. The various parasites which attack the eggs and caterpillars at different stages of growth have been imported; they are reared in this country until suf- ficiently numerous, and are
RMRD3WEJ–. Elementary entomology. Insects. 250 ELEMENTARY ENTOMOLOGY and we are just commencing to learn how to utilize them in com- bating imported insects. Thus the state of Massachusetts and the United States Bureau of Entomology are now carrying on ex- tensive experiments in the importation of the parasites of the gypsy and brown-tail moths, which are very largely effective in holding those insects in control in Europe. The various parasites which attack the eggs and caterpillars at different stages of growth have been imported; they are reared in this country until suf- ficiently numerous, and are
Elementary entomology ([c1912]) Elementary entomology elementaryentomo00sand Year: [c1912] 250 ELEMENTARY ENTOMOLOGY and we are just commencing to learn how to utilize them in com- bating imported insects. Thus the state of Massachusetts and the United States Bureau of Entomology are now carrying on ex- tensive experiments in the importation of the parasites of the gypsy and brown-tail moths, which are very largely effective in holding those insects in control in Europe. The various parasites which attack the eggs and caterpillars at different stages of growth have been imported; they are rea
RMRWTAD6–Elementary entomology ([c1912]) Elementary entomology elementaryentomo00sand Year: [c1912] 250 ELEMENTARY ENTOMOLOGY and we are just commencing to learn how to utilize them in com- bating imported insects. Thus the state of Massachusetts and the United States Bureau of Entomology are now carrying on ex- tensive experiments in the importation of the parasites of the gypsy and brown-tail moths, which are very largely effective in holding those insects in control in Europe. The various parasites which attack the eggs and caterpillars at different stages of growth have been imported; they are rea
. Elementary entomology. Entomology. 250 ELEMENTARY ENTOMOLOGY and we are just commencing to learn how to utilize them in com- bating imported insects. Thus the state of Massachusetts and the United States Bureau of Entomology are now carrying on ex- tensive experiments in the importation of the parasites of the gypsy and brown-tail moths, which are very largely effective in holding those insects in control in Europe. The various parasites which attack the eggs and caterpillars at different stages of growth have been imported; they are reared in this country until suf- ficiently numerous, and
RMRD1CA4–. Elementary entomology. Entomology. 250 ELEMENTARY ENTOMOLOGY and we are just commencing to learn how to utilize them in com- bating imported insects. Thus the state of Massachusetts and the United States Bureau of Entomology are now carrying on ex- tensive experiments in the importation of the parasites of the gypsy and brown-tail moths, which are very largely effective in holding those insects in control in Europe. The various parasites which attack the eggs and caterpillars at different stages of growth have been imported; they are reared in this country until suf- ficiently numerous, and
Elementary entomology (1912) Elementary entomology elementaryento00sand Year: 1912 250 ELEMENTARY ENTOMOLOGY and we are just commencing to learn how to utilize them in com- bating imported insects. Thus the state of Massachusetts and the United States Bureau of Entomology are now carrying on ex- tensive experiments in the importation of the parasites of the gypsy and brown-tail moths, which are very largely effective in holding those insects in control in Europe. The various parasites which attack the eggs and caterpillars at different stages of growth have been imported; they are reared in t
RMRWTAD8–Elementary entomology (1912) Elementary entomology elementaryento00sand Year: 1912 250 ELEMENTARY ENTOMOLOGY and we are just commencing to learn how to utilize them in com- bating imported insects. Thus the state of Massachusetts and the United States Bureau of Entomology are now carrying on ex- tensive experiments in the importation of the parasites of the gypsy and brown-tail moths, which are very largely effective in holding those insects in control in Europe. The various parasites which attack the eggs and caterpillars at different stages of growth have been imported; they are reared in t