11
F
Sof t
f
rui t Day
F
infection from the ground and there are chemical drench
products to combat the disease.
h
owever,
e
rika is looking to
the futurewithmore sustainable treatments inmind. She
particularlywants to hear about any experiences from cane
fruit growers tryingbiofungicides such as SerenadeAS
o
(
Bacillus subtilis
strainQST713) andPrestop
(Gliocladium
catenulatum
strain J1446) both of which are commercially
available. Although only allowed for crops in glasshouses via an
e
AM
u
, T34Biocontrol Trichoderma asperellum strain is
claimed to induce systemic acquired resistance in plants.
i
t is
still early days for achieving the best efficacy from alternative
products, withmore 2016 results due later fromproject S
f
158
andpotentiallymore information on biofungicide application
methods from theAMB
er
project CP158.
DavidBuss of N
i
AB
e
M
r
made the observation that
repeated fungicide applications in some tankmixes can knock
out predatory phytoseiidmites (
Neoseiulus cucumeris
)
introduced to control thrips and tarsonemid, leading to
unexpected loss of biocontrol. Themessage is that careful
thought needs tobe given to the tankmixes used, ensuring
that thrips and tarsonemid control is achieved early before
S
w
D enters the crop and requires insecticidal treatment.
Cane fruit pests
Chantelle Jay of N
i
AB
e
M
r
reported on two years of trials
looking at how aS
w
D spray programme affects
i
PM in
raspberries. The aimwas to test whether themethod of spray
application could helpprotect predators, particularly by
targeting the upper leaf surface rather than the lower. The
results of the second year of trialswere just in andChantelle
was able to report some encouraging conclusions. Non-
targeted knapsack sprayinggave good spray coverage that
reducedS
w
D numbers but diddecrease the numbers of
natural phytoseiids, although numbers of introducedpredatory
mites (
Phytoseiulus persimilis
) increased.
u
sing overhead
boom sprayingwithAlbuz A
fr
80 nozzles, rather than the
misting ones used in the first year, reduced spray deposits on
the lower leaf surface andprotected the natural phytoseiids,
giving good control of two-spotted spidermite (TSSM). The
overhead spraying also reduced numbers of S
w
D to a similar
level to the resultswith the knapsack sprayer.
JudeBennison of ADAS reported site-monitoringon
commercial raspberry farms that showed that spidermite
predators are not being affectedby raspberry beetle andS
w
D
control measures. Naturally occurring
N. californicus
and
A.
andersoni
seemed toplay an important role inmaintaining
TSSM control when insecticide programmeswere used to
control S
w
D and other pests.
Blackcurrant research
Michelle
f
ountainwas very pleasedwith the progressmade
in developingpheromone traps for gooseberry and
T
he
frui
TG
rower
•
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u
A
r
Y 2017
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