Vol. 16—1962 - NorthEastern Weed Science Society

Vol. 16—1962 - NorthEastern Weed Science Society Vol. 16—1962 - NorthEastern Weed Science Society

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ab1e 3. Po~ato Vine Killing Discoloration Stud~es - Maine-1960 - Katahdin and Kennebec Varieties ..... 't! -- -~- - Df:scoloration Indexd Killil;l8 ,; Dealc()~~ ,< Bate/acre Actiy_@..~~~ __ Jndex.o!{ Katahain Kennebec ~o treatment - . -~ 1.0 0.0. 0.2 sodium arsen! te 1 lb. (As~03) 4 oz. plyac ~.o 0.3, 0.3 . It 2 Ibs. ' ,".0 0.8 0.5 " 3 Ibs. II " .0 1.2 . 0.8 n h Ibs. II II 5.0 1.6 1.4, " 6 Lbs , 'II It 5.0 3.0,' 3.0 l!' 81bs. '11 n· 5.0 16.2' 26.0 It 10 lbs. II ~. " II 5.0 31.4'" 42.5' .: premerge 1 qt:. 5ga,l8.fuel oil ", ' • ", " • • Roto-beater Ice water Fuel oil. only 2 qts. p1us 4 oz~ • II Plyao 5.0 5.0 6.2, 15.0 5.8 . 16.2 3.0 0"3' 0.$' 100 gals. -- 3.0 0.5 0.8 ~ ga1~. ~_ __~ -- 4.0 0.5'____0.5' V A:verage of two dates ,,~, an~ ~d~ys flftet- $em1ca~s applied on August'~, 1960 •• ' ?:I ~ighted average of au l'epl1c.tes of eaphvaJ,"hty or a "total of 360b i tubers. r; Examination of tubers made at two dates December 7, 1960 and January. 25, 1961. "(; '- . (. (

195 PROBLEMSIN THEAPPLICATIONOF HERBICIDESBI SMALLSCALEUSERS Arthur Bini mrRODUCTION Applied h~r1:>icide researcn is carried out to 4fvelop newer and better methods that can be used by the cOllllllercial farmer and 'possibly the home owner to control weeds in his plantings. Chemical control of weeds in ornamental crops has been invest1g",ted for several years and IlIWly reports have been presented at this conference. These repo:r:t;s included data on the herbicidal activity of II1Bll¥cOD;lOundsand the tj)lerance of a wide variety of ornamental plants to thel>e com:pounds. Mijch of this information has been utUized in formulatilli useful and success:(1,Jl weed control practices. Usually growers, with the advice of their county agricultural agent or COllllllercial representative, try tb.e more promising wbicides on a small scale on their crops 'under their own specific condi1;ioIlS. Then, if the small scale treatments are encoU1!8g:LJ:lg, the groweru,ses the chemicals on a larger scale. The' encouraging results of the experimenter or successful usage by a few growers occasionally is followed by poor, if not disasterous, results by other growers or home owners. Thil$ paper will be concerned with some of the failures and what we think are their causes. Werea4ily tell of our successes but conceal our failures. However,detailed lnfoa:mation on the faUuresis essential to the development of a BOund weed control prol!Wam. GLADIOLUS Ex.perimental preemergence treatments of plantinss of small gladiolus corms on sandy loam on Long Island in 1959 (2) with simazip.e granular and liquid resulted in fa;trly good control of most weeds at the- 2, 3, and 4 pound per acre rates. The gladiolus foliage showed some burning atter emergence but leaves that developed later were normal. A highly s~nificant delay in nowering and a significant reduction in cut nower y,Leld resulted from all rates. There were no significant reductions in corm yield. Similar results were obtained by other research workers in other states. Consequently, in the 1960 Gladiolus Weed Control SUI/IIIary published in, the North American Gladiolus CoUncil Bulletin (3)simaz:l.ne was not reo~nded for use on gladiolus by any of the experiment stations. Simazine is not recollllllended for use on gladiolus by the manufacturer. However, inclUded in the 1960 Sl\llllll&'Y were grower reports of good weed control, witil, simazine under their conditions. On the basis of the favorable grower reports, one New Jersey grower band treated all plantings of corms and cormEU.swith a preemergence spray of 1 pound actual simazine per acre. There WIle good weed control. On the rolling land there were several knolls of s~ soU with heavier soU on the nat ground around them. Gladiolus plants on the sandy knolls were severely damaged or killed. Gladiolus on the heavier soil were not aftecte,d. A check on the amount of material used, by lookinga:t the amount of material 1. Associate Professor, Cornell Ornamentals Research Laboratory

ab1e 3. Po~ato Vine Killing Discoloration Stud~es - Maine-1960 - Katahdin and Kennebec<br />

Varieties<br />

.....<br />

't!<br />

-- -~- - Df:scoloration Indexd<br />

Killil;l8<br />

,;<br />

Dealc()~~<br />

,<<br />

Bate/acre Actiy_@..~~~ __ Jndex.o!{ Katahain Kennebec<br />

~o treatment - . -~ 1.0 0.0. 0.2<br />

sodium arsen! te 1 lb. (As~03) 4 oz. plyac ~.o 0.3, 0.3 .<br />

It 2 Ibs. ' ,".0 0.8 0.5<br />

" 3 Ibs. II " .0 1.2 . 0.8<br />

n h Ibs. II II 5.0 1.6 1.4,<br />

" 6 Lbs , 'II It 5.0 3.0,' 3.0<br />

l!' 81bs. '11 n· 5.0 16.2' 26.0<br />

It 10 lbs. II ~. " II 5.0 31.4'" 42.5' .:<br />

premerge 1 qt:. 5ga,l8.fuel oil ", ' • ", " •<br />

•<br />

Roto-beater<br />

Ice water<br />

Fuel oil.<br />

only<br />

2 qts.<br />

p1us 4 oz~<br />

• II<br />

Plyao 5.0<br />

5.0<br />

6.2,<br />

15.0<br />

5.8 .<br />

16.2<br />

3.0 0"3' 0.$'<br />

100 gals. -- 3.0 0.5 0.8<br />

~ ga1~. ~_ __~ -- 4.0 0.5'____0.5'<br />

V A:verage of two dates ,,~, an~ ~d~ys flftet- $em1ca~s applied on August'~, 1960 •• '<br />

?:I ~ighted average of au l'epl1c.tes of eaphvaJ,"hty or a "total of 360b i tubers. r;<br />

Examination of tubers made at two dates December 7, 1960 and January. 25, 1961.<br />

"(;<br />

'- .<br />

(. (

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