. Controllo chimico della spazzola in ponderosa pine foreste del centro di Oregon. Comando spazzola Oregon; Ponderosa Pine Oregon. Coprire morti 100 percento. 6 TH 27TH 5 TH ?2ND maggio giugno luglio agosto settembre figura 5. - Percentuale di copertura manzanita ucciso da 2, 4 D e 2, 4, 5 - T applicata a quattro differenti date (base: 64 lotti). Risultati da 0,5- e -pound-per-acro i tassi sono stati mediati per ogni data. Il vettore di emulsione conteneva 1 gallone di olio estivo per acro. erbicidi aveva già cominciato a cadere dal luglio 31 . L'efficacia di 2, 4, 5- T è caduto ancora più rapidamente del fatto che di 2, 4-D come s

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. Chemical control of brush in ponderosa pine forests of central Oregon. Brush Control Oregon; Ponderosa pine Oregon. COVER DEAD 100 Percent. 6 TH 27TH 5 TH ?2ND MAY JUNE JULY AUGUST SEPTEMBER Figure 5. — Percentage of manzanita cover killed by 2, 4 - D and 2, 4, 5 - T applied at four different dates (basis: 64 plots). Results from 0.5- and -pound-per-acre rates were averaged for each date. The emulsion carrier contained 1 gallon of summer oil per acre. herbicides had already begun to fall off by July 31 . Effectiveness of 2, 4, 5- T fell off even more rapidly than did that of 2, 4-D as the season advanced. The late September application of 2, 4, 5-T at the 1-pound rate in emulsion carrier killed only 33 percent of the manzanita cover, compared with 66 percent killed by 2, 4-D. Differences in percentage of manzanita cover killed between the two car- riers and between the four dates of application were statistically significant at the 1-percent probability level. Differences between chemicals were significant only for the late September application, at the 1-percent level. Golden Chinkapin Tests on chinkapin showed that 2, 4, 5-T was the most effective chemical, that an emulsion carrier was definitely superior to a water carrier, and that mid- June treatments produced a better kill of aerial parts than late September appli- cations (fig. 6). The mid-July 1956 test further showed that the 0. 5-pound-per- acre rate of 2, 4, 5-T in an emulsion carrier produced a complete top kill. Ami- trole and trichlorobenzoic acid were not effective. Differences between effectiveness of 2, 4, 5-T, 2, 4-D, silvex, and 2-(2, 4-DP) at the mid-June application were significant at the 1-percent level. Difference in effectiveness between emulsion and water carriers was significant at the 5-percent level. -11-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not p

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