R. Chrystal

发表

Natural Enemies of Sirex cyaneus , Fabr., in England and their Life-history

J. G. Myers, R. Chrystal, 1928 .

The Sirex Wood-wasps and their Importance in Forestry

R. Chrystal, 1928 .

The Genus Dreyfusia (Order Hemiptera, Family Chermesidoe) in Britain, and Its Relation to the Silver Fir

R. Chrystal, 1926 .

Studies of the Sirex Parasites

R. Chrystal, 2022 .

The genus Dreyfusia in Britain and its relation to the Silver fir.

R. N. Chrystal, R. Chrystal, 1925 .

The silver fir chermes

R. Chrystal, 1926 .

STUDIES IN THE BIOLOGY OF XYLONOMUS BRACHTYABRIS KR., AND X. IRRIGATOR F., PARASITES OF THE LARCH LONGHORN BEETLE, TETROPIUM GABRIELI WEISE

E. Skinner, R. Chrystal, 1931 .

Gall midges of trees

R. Chrystal, H. Barnes, 1951 .

The Forest-Insect Problem in Stanley Park

R. Chrystal, 1916 .