Pamphlets on Forestry in New York, Том 3 |
Из књиге
Резултати 1-3 од 29
Страница 51
... pest . During this time there has been an occasional reference to it as a forest - tree despoiler , but it was not until 1907 that it again appeared as a serious pest , in New York State at least . During that year it seriously injured ...
... pest . During this time there has been an occasional reference to it as a forest - tree despoiler , but it was not until 1907 that it again appeared as a serious pest , in New York State at least . During that year it seriously injured ...
Страница 55
... PEST The first reference to this insect as a fruit pest that the writer finds is by Thomas in his Second Illinois Report , in which he says that he twice found the larvae on apple trees , though not in large numbers , and had reared ...
... PEST The first reference to this insect as a fruit pest that the writer finds is by Thomas in his Second Illinois Report , in which he says that he twice found the larvae on apple trees , though not in large numbers , and had reared ...
Страница 3
... pest to shade- trees in this State . It prob- ably destroys more shade - trees , certainly more elm trees , than all other insect pests com- bined . STORY OF ITS LIFE In the fall of the year many of the full - grown beetles , in ...
... pest to shade- trees in this State . It prob- ably destroys more shade - trees , certainly more elm trees , than all other insect pests com- bined . STORY OF ITS LIFE In the fall of the year many of the full - grown beetles , in ...
Друга издања - Прикажи све
Чести термини и фразе
abundant antheridium appear arsenate of lead Artotrogus balsamifera bark become beetles branches bronze birch borer buds Bulletin burrow caterpillars Certinensis cities clusters color common cones conidia conidium Coprinus Cornell University cottonwood Cronartium ribicola currants damping decay developed diameter disease egg cell elm leaf-beetle English elms Entomology European aspen Experiment Station foliage forest fruit body fungi fungus germinate ground growing growth grubs Horticulture Husbandry hypha I. P. ROBERTS inches long infested injury insect Ithaca killed larch case-bearer large number larva larvæ leaf leaves Lombardy maple mycelium Nature-Study nearly Norway spruce nursery observed oogonium parasite pest pileus plants Polyporus poplar Populus prothallia prothallium protoplasm pruning red spruce Ribes rust season seed seedlings shade trees side soil species specimens sporangium spores spraying spring spruce stem surface threads timber tissue trunk tube twigs usually white birches white oak white pine winter wood York young zoospores