. Die Erweiterung der Kenntnisse der Wälder und Weideflächen: 1984 Forschung Leistungen. Holz Forschung United States Bibliographie; Wälder und forstwirtschaftliche Forschung United States Bibliographie, Waldbrände Forschung United States; Schädlinge Forschung United States; Waldbewirtschaftung Bibliographie. Neue Belastung der Bacillus thuringiensis gegen Wald Schadinsekten Bacillus thuringiensis (B.t.) ist ein bakter-rium, das eine natürlich vorkommende Krankheit des Blattes - beißend-kauende Insekten. Seit 1970 ist eine B.t. Belastung benannten HD-1 in verschiedenen Formel vermarktet worden ist- als mikrobielle Insektizid. Es ist

• Bildanbieter: Book Worm / Alamy Stock Foto
• Bild-ID: RFCNJ9
• Dateigröße: 7,1 MB (454,7 KB Komprimierter Download)
• Freigaben (Releases): Model - nein | Eigentum - nein
• Format: 1820 x 1373 px | 30,8 x 23,2 cm | 12,1 x 9,2 inches | 150dpi

Weitere Informationen

Dieses Bild ist ein gemeinfreies Bild. Dies bedeutet, dass entweder das Urheberrecht dafür abgelaufen ist oder der Inhaber des Bildes auf sein Urheberrecht verzichtet hat. Alamy berechnet Ihnen eine Gebühr für den Zugriff auf die hochauflösende Kopie des Bildes.

Dieses Bild kann kleinere Mängel aufweisen, da es sich um ein historisches Bild oder ein Reportagebild handel

. Advancing knowledge of forests and rangelands : 1984 research accomplishments. Wood Research United States Bibliography; Forests and forestry Research United States Bibliography; Forest fires Research United States; Insect pests Research United States; Forest management Bibliography. New Strain of Bacillus thuringiensis for Use Against Forest Insect Pests Bacillus thuringiensis (B.t.) is a bacte- rium that produces a naturally occurring disease of leaf-chewing insect pests. Since 1970, a B.t. strain designated HD-1 has been marketed in various formula- tions as a microbial insecticide. It is now competitive in price and effective- ness with chemicals for control of leaf- chewing insects. A new strain of B.t. was isolated from spruce budworm larvae by a Northeastern Station scien- tist. This strain, called NRD-12, is being extensively field tested in the United States and Canada. Taxonomically, NRD-12 is closely related to HD-1. The similarity between the strains extends to some pathogenic char- acteristics. The cabbage looper, the insect designated as the universal stan- dard insect used to assess and standard- ize the potency of B.t. strains and formulations against lepidopteran pests, is equally susceptible to both strains of B.t. The NRD-12 strain is, however, two times more potent than HD-1 against the spruce budworm, one of the most de- structive native forest insect pests in North America. The rate of kill of NRD-12 when used against the budworm is nearly twice as fast as that of HD-1. This insecticidal characteristic is of major importance when foliage protec- tion is of prime consideration. The 25 characteristic of this new strain is not limited to these two pests. The gypsy moth, a major forest insect pest of the Northeastern United States, is nearly four times more susceptible to NRD-12 than to HD-1. Large field tests of NRD-12 are in prog- ress. If the strain performs as well there as in the laboratory, it may soon replace HD-1. NRD-12 has been register

Stockbilder mithilfe von Tags suchen

• bookcentury1900
• buchpublikationen