NZBOT100 Managing Botryis
T Lupton, Lewis Wright Valuation
Botrytis is the major bunch rot affecting winegrapes in New Zealand.
Botrytis fungicide residues are persistent and detectable in wines.
Controlling Botrytis requires an integrated approach involving vigour control, canopy management, fungicide application and reduction in Botrytis inoculum.
NZBOT 100 MANAGING BOTRYTIS (245 KB)
NZBOT101 Assessing Botrytis spray coverage
David Manktelow, Applied Research and Technologies Ltd
Water sensitive papers (WSPs) are a superior method for assessing spray coverage. WSPs should be used to assess bunch coverage prior to key Botrytis fungicide applications mid-fl owering and pre-bunch closure. 10 WSPs are folded in half and pinned to shoots adjacent to bunches. A minimum of 70% of papers should show adequate coverage to achieve good Botrytis control.
NZBOT 101 ASSESSING SPRAY COVERAGE FOR BOTRYTIS (237 KB)
SWNZ100 Grass Grub Beetle damage
The New Zealand grass grub beetle can cause sudden damage to vineyards in late spring, defoliating shoots and leaves.
Damage is often confined to vineyard edges, where beetles emerge from headlands or neighboring paddocks.
Populations usually peak 2-3 years after cultivation – often coinciding with the vulnerable first crop on a vineyard.
SWNZ100 Grass Grub Beetle Damage (389 KB)
NZTD100 What is petri disease?
Dr Marlene Jaspers, Lincoln University
Petri disease can significantly limit the growth and productivity of young vines.
Initial infection is by air-borne spores that typically enter through stem or root wounds in young vines during their establishment phase in the vineyard.
Damaging symptoms develop most often in stressed, young vines.
Control strategies focus on growing healthy plants in stressfree conditions and on preventing infection of pruning or trimming wounds.
NZTD 100 Trunk Diseases Petri (417 KB)