F
Scab Cont
r
ol
F
ef
r
uitg
r
owe
r
.co.uk
ThE FrUITGrOWEr •MArCh 2017
2016 andBASF
h
as
launc
h
edSe
r
cadis fo
r
t
h
e
2017 season. ASDhI
p
r
oduct is coming f
r
om
Baye
r
C
r
opScience, but
p
r
obably not until 2018.
resistance to t
h
eSDhI
g
r
oup
h
as al
r
eady been seen
in ce
r
eals in 2015, so FrAC
guidelines a
r
e t
h
at only fou
r
applications of SDhI
c
h
emist
r
y s
h
ouldbe used
pe
r
c
r
oppe
r
yea
r
. T
h
is
h
as
implications fo
r
apples in
deciding t
h
e best sequence
and timingof p
r
oducts to
maximise t
h
ei
r
benefit as pa
r
t
of t
h
e p
r
og
r
amme.
Bellis
(boscalid+py
r
aclost
r
obin) is
not t
h
e st
r
ongest on scab o
r
mildewbut
h
as excellent
activity onNect
r
ia, blossom
wilt andon sto
r
age
r
ots. It is a p
r
otectant only, wit
h
two
applications pe
r
c
r
op and a seven-dayhI. Fontelis
(pent
h
iopy
r
ad) is bot
h
a p
r
otectant and
h
as kickback on
scabwit
h
goodmildew activity and
h
as excellent
r
ainfastness, wit
h
two applications pe
r
c
r
op, a 21-dayhI and
some activity against
r
ots. Se
r
cadis [fluxapy
r
oxad (Xemium)]
is a p
r
otectant wit
h
good activity againstmildew and
outstanding
r
ainfastness. T
h
e
r
e can be t
hr
ee applications pe
r
c
r
opbut it
h
as a 35-dayhI. It
h
as a p
h
ysiological effect on
t
h
e t
r
ee, givingbigge
r
g
r
eene
r
leaves.
2017will be t
h
e last yea
r
of use fo
r
Maccani. It offe
r
s
outstanding scab cont
r
ol, but it’s impo
r
tant to
r
emembe
r
t
h
e
Dit
h
ianon
r
est
r
ictions. T
h
e loss of Maccani may inc
r
ease t
h
e
impo
r
tance of St
r
obyWG t
h
at, wit
h
t
h
e addition of Dit
h
ianon,
h
as a good combination of p
r
otectant activity on scab and
mildew and good
r
ainfastness, and t
h
e
r
e is no evidence of
r
esistance toSt
r
oby in t
h
eUK. Scala is a st
r
ong tank-mix
pa
r
tne
r
a
r
ound flowe
r
ing to usewit
h
p
r
otectant p
r
oducts as it
also
h
as activity on blossomwilt. Switc
h
is also ve
r
y effective
against blossomwilt, sto
r
age
r
ots andNect
r
ia, but is in t
h
e
same c
h
emical g
r
oup as Scala.
C
hr
is Lillyw
h
ite gave an update
r
ega
r
dingold stalwa
r
ts in t
h
e
cont
r
ol of scab cont
r
ol, suc
h
asCaptan. All Captan p
r
oducts
a
r
e now aut
h
o
r
ised fo
r
use on apples andpea
r
swit
h
a
maximumdose of 2kg/
h
awit
h
ten days between applications
and amaximumof ten applications pe
r
season, and a 31-day
hI. It’s vital to
r
emembe
r
t
h
at t
h
e adve
r
se effect of alkaline
wate
r
can give a sp
r
aymix a 10-minute
h
alf-life. G
r
owe
r
s
h
ave
asked if t
h
ey can alte
r
nate b
r
ands to applyCaptan eve
r
y
seven days. CrD’s view is t
h
at suc
h
p
r
actice s
h
ouldbe
st
r
ongly discou
r
aged. It couldbe seen as going against t
h
e
legal
r
equi
r
ement to take all
r
easonable p
r
ecautionsw
h
en
usingpesticides top
r
otect people, animals and t
h
e
envi
r
onment. It is alsopossible t
h
at t
h
e
r
epeated use of simila
r
p
r
oducts could lead to t
h
e pe
r
mittedmaximum
r
esidue levels
in t
h
e t
r
eated c
r
opbeing exceeded.
Mancozeb now
h
as amaximumdose of 2kg/
h
awit
h
a
maximum fou
r
applications pe
r
season and a 28-dayhI.
Ka
r
amateD
r
y FloNeotec is aut
h
o
r
ised fo
r
apples andpea
r
s
wit
h
amaximum concent
r
ation of 2.5kg/1000 lit
r
es.
PenncozebWG is aut
h
o
r
ised fo
r
apples only, wit
h
amaximum
concent
r
ation of 4kg/1000 lit
r
es. Syst
h
ane 20EW can be sold
until 28 Feb
r
ua
r
y 2017 andmust be usedby 30Septembe
r
.
T
h
e dose is t
h
e key top
r
otectant activity. Inda
r
5EW can be
used until 31August but is no longe
r
available fo
r
sale.
W
h
at is filling t
h
e gap in t
h
emont
h
befo
r
e
h
a
r
vest now t
h
at
t
h
e
r
e is a longe
r
h
a
r
vest inte
r
val fo
r
Captan? T
h
e answe
r
is
Bellis, w
h
ic
h
is goodon sto
r
age
r
ots but weake
r
fo
r
scab and
h
as a seven-dayhI, o
r
Switc
h
, w
h
ic
h
is bette
r
fo
r
scab and
h
as a t
hr
ee-dayhI.
C
hr
is concluded t
h
at t
h
e good news is t
h
at t
h
eSDhI g
r
oup
of fungicideswill be b
r
inging good scab andmildew cont
r
ol
and, w
h
ilst t
h
e bad news is t
h
at we a
r
e losing some p
r
oducts,
we do
h
ave suitable alte
r
natives, alt
h
oug
h
h
e admits t
h
at
seven-day sp
r
ay p
r
og
r
ammes a
r
e difficult to
h
andle. It is
impo
r
tant to note t
h
at wewill need to
r
eplaceSyst
h
ane, Inda
r
andMaccani in ou
r
p
r
og
r
ammes afte
r
t
h
is yea
r
. Mike
hutc
h
inson, summing up t
h
e situation, said, “Alt
h
oug
h
we
h
ave lost some p
r
oducts and
h
ave
r
est
r
ictions on t
h
e use of
ot
h
e
r
s, we still
h
ave enoug
h
in t
h
e a
r
mou
r
y todelive
r
a clean
c
r
op if g
r
owe
r
s
h
ave good ag
r
onomic advice and a
r
e able to
r
eact p
r
omptly.”
◆
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