Vol. 15—1961 - NorthEastern Weed Science Society

1730
Additiona! apple .,samples were provided for amino triazole
determinations by the FDARapid Method using the Bratton··Ma.rshall procedure
and are reported in Table 3.
Table 3. Amino triazole residue and recovery ana.lysesa of StaymanJ
g,o!~n_D!l!c!0.!!S_a.:!d_R~ ~l!s.:. .~ ,_. __
=---------~----_._---~-~_._~--------~-~---
I ., Recovery of added ATA '
Variety ATA -J.!1!A -,-PercEmt.
treatmen~ (ppm)' ATA added t Recovered' Recoveryb '.Tree
rate in I (ppm)' (ppm) ,
t
, orchard' • , , I
,I ATA 7 ADiO,m:£'"ot. ­
----~----------------------------------
, '. I , , •
Stayman o 0.001 , 0.15 0.09 60 , C-R5T10
0.25 0.21 84
0·50 0.457 91
" ,
-
stayman
0.011 , 0.25 , 0.234 89 'c-R16T8
Stayman
0.012 , 0.25 0.214 80 tC-Rl3T2
Stayman 0.038 ' 0.25 0.249 84 fC-Rl2T13
t
Golden
Delicious' 0.08 , 0.15 0.10 67
0.25 0.20 80
0·50 0.42 84
Golden
Delicious' 4 c 0.083 ' 0.25 0.311 91 'K-R5T4
Rome
,gome
to'
.!.._ _ '2!i~
0.037'
' __ 0..:.0.2.3_' __ Q.·g5__ 0.25
' _ Q..gr§_ 0.2'{ '97
.
~ _ 20
a Analyses by C. W. Eng] and Laboratories with the FDARapid Method
using the Bratton-Marshall procedure for amino triazole.
b Controls were subtracted before recoveries were calculated.
c The ground, cover beneath each of these trees was sprayed in 1957,
1958, and 1959.
d Samp1es of Golden Delicious on market presumably from trees 'Where
amino triazole had not been used.
'K-R4T21
~K-~4~ •
From the analyses presented in Tab1e 3 no relationships in amino
triazole residues are apparent between apples from trees 'Where amino
triazole had been spraYed beneath them and from untreated trees. Differences
between varieties have not been accounted for except to postulate that
some varieties have more amino-like compo\mds present in the fruit than
do othe r varieties.
•
1.- Schubert"; Oscar Ef.- 19597 -Effect of recommended and excessive
rates of certain herbicides to apple trees of varying ages. Proc .
13th Annual Meeting :NE'WCC:62-63.