South African Avocado Growers’ Association
2000 Yearbook
Volume 23
Table of Contents
iv Foreword
v Chairman's report
1 The effect of pre- and postharvest calcium
applications on the postharvest quality of Pinkerton avocados
M G Renter and P J C Stassen
8 Recommendations for controlling the postharvest problems
of the Pinkerton cultivar
F J Kruger,
M Kritzinger and R Malumane
15 Progress in identifying the primary causes of
mesocarp discoloration in cv Pinkerton
J P Bower, Z Van Rooyen
and G A Allwood
21 Evaluation of avocados exported to Europe and the UK
during the 1999 season
R M Nelson, D J Donkin, J J Bezuidenhout, G J Eksteen, M Huysamer and M
Oosthuizen
30 Hass avocado yields as affected by dwarfing rootstocks
and flower pruning
D J Roe and T M Morudu
33 Planning and managing new avocado orchards
B Snijder, J M Mathumbu and P J C Stassen
36 Pruning and managing existing avocado orchards
B Snijder, J M Mathumbu and P J C Stassen
39 Results with pruning of existing avocado orchards
B Snijder, J M Mathumbu and P J C Stassen
43 Effect of gibberellic acid treatments on flowering
of avocado
T Rossouw, P J Robbertse, S Kremer-Köhne and
J S Köhne
46 The effect of growth inhibitors on fruit production
in Hass avocado trees
M G Renter, B Snijder, P J C Stassen and E Schäfer
52 New Hass-like avocado cultivars at Merensky
Technologica Services - progress report
S Kremer-Köhne
56 Macro nutrient accumulation and requirement of Hass
avocado trees
B Snijder and P J C Stassen
63 Sucrose movement and metabolism in small Hass avocado
fruit
R F Cripps and A K Cowan
70 Field testing of new avocado rootstocks for
tolerance to root rot
S Kremer- Köhne and J A Duvenhage
72 Regulation of isoprenoid metabolism and Hass avocado
fruit: An overview
E W Richings and A K Cowan
79 The role of
cytokinin, auxin and abscisic acid metabolism
in the control of Hass avocado fruit size
N J Taylor and A K Cowan
83 Ekonomiese drempelwaardes, 'n opname-tegniek en beheertydsberekening
in 'n geïntegreerde plaagbe- stuursprogram
vir die beheer van suigbesies by avokado
I J Bruwer
90 Duur van onvolwasse lewenstadia, generasiepieke en
migrasiepatrone van suigbesies (Hemipterans) by avokado
I J Bruwer
95 Report on the epidemiology of pepper spot on Hass avocado
M H Schoeman and B Q Manicom
99 Host status of Hass avocado fruit for the false codling
moth, Cryptophlebia leucotreta (Meyrick) (Lepidoptera: Tortricidae)
T Grové, W P Steyn and M S De Beer
103 Further evaluation of heat shock treatments to develop
tolerance in quarantine cold treatments
T Grové, M S De Beer and W P Steyn
110 Preliminary investigation into the use of
controlled atmosphere (CA) to control false codling moth (FCM) in Hass avocados
with a view to gaining market access to the USA
Bruce Tate and Vaughan Hattingh