Syngenta Summer Autumn Guide 2020 - Page 60



INTEGRATED PEST
MANAGEMENT
CSFB – DRILLING
SEEDBED PREPARATIONS & MOISTURE MANAGEMENT
Syngenta data indicated two peaks of CSFB activity from the 19th July - 16th
August and 17th - 24th September in 2019. Stem weevil came in later from 1st
October until 25th October. Damage was consistent throughout the season. Due
to this, control proved to be difficult with such a long window of activity, making
drill timing advice extremely challenging. The best advice is trying to drill into fine
seedbeds, plenty of moisture with good quality seed and rolling to consolidate,
this gives the crop the best chance of success.
Moisture management was key to successful establishment in 2018 and
2019 drilling, where in a dry season we found that direct drilling and moisture
conservation through increased surface trash improved yield by up to 15% (over
a plough based system). A smoother surface from direct drilling may also have
provided a less comfortable habitat for pests.
Increasing seed rates was successful in terms of establishment. Syngenta trials
demonstrate that when drilled at 150 seeds/m2, the crop established well in a
cultivated scenario compared to 50 seeds/m2.
However, drilling at a higher rate for a thicker crop can increase the burden of
CSFB. Planting at a higher seed rate in order to counter the survival of adult
damage can result in 3x the number of CSFB per hectare, compounding the
pressure for the following year.
Direct drill
30th August
Cultivated
early August,
drilled 30th August
Picture date: 17th October
FIELD TRIAL RESULTS (IN A LOW KDR RESISTANCE AREA)
UNTREATED
1ST APPLICATION: 17/10
HALLMARK Zeon 75 mls/ha
DOUBLE APPLICATION:
17/10 HALLMARK Zeon 75 mls/ha
02/11 HALLMARK Zeon 75 mls/ha
Second application advised if efficacy is seen and a new migration occurs, otherwise STOP.
60

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