South African Avocado Growers’ Association
1999 Yearbook
Volume 22
Table of Contents
V Foreword
Vii Chairman's report
1 The Hass small-fruit syndrome: Solving a 50
million rand per season problem
R F Cripps, E W Richings, N J Taylor and A K Cowan
7 Die invloed van blomontwikkeling op die
koloniserings - en migrasiepatrone van suigbesies (Hemipterans) by avokado
I J Bruwer
12 Factors affecting biocontrol efficacy of Bacillus
subtilis
against Colletotrichum gloeosporioides
W Havenga, E S De Jager and L Korsten
22 Some factors affecting pollination and yield of Hass
avocados
M F Johannsmeier
and T M Morudu
26 Geïntegreerde beheer van suigbesies (Hemipterans)
by avokado
I J Bruwer
31 The false codling moth, Cryptophlebia leucotreta
(Meyrick) (Lepidoptera: Tortricidae) on avocado - a literature review
T Grové, W P Steyn and M S De Beer
34 Performance of new avocado rootstocks at Westfalia Estate
D J Roe and T M Morudu
35 Survey of fungicide resistance of Colletotrichum
gloeosporioides
from different avocado production areas
G M Sanders and L Korsten
39 Reaction of avocado wood on injections into the
trunk
P J Robbertse and J A Duvenhage
48 Hot water treatment of avocado fruit to induce cold
tolerance
S Kremer-Köhne
51 Pruning mature and encroached avocado trees to restimulate
and maintain production and fruit quality
B Snijder and P J C Stassen
55 Application of a highly sensitive avocado sunblotch
viroid indexing method
M Luttig and B Q Manicom
62 Training and manipulation of young avocado trees
B Snijder and P J C Stassen
69 Chemical manipulation as part of a management programme
for improved fruit yield and quality in avocado orchards
M J Penter and P J C Stassen
76 Handling procedures for avocados: 1999 season
G J Eksteen
84 Flower pruning of Hass avocado when going into an "on"
year in an attempt to decrease alternate bearing and increase fruit size
D J Roe and T M Morudu
88 Thermal fogging of fungicides for the control of Pseudocercospora
purpurea on avocado
J A Duvenhage and J S Köhne
91 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
93 Die invloed van organiese bemesting op die opbrengs
en vruggrootte van Hass avokadobome
H J Erasmus, W G Gaum and A Hildebrand
102 The effect of heat shock treatments followed by a quarantine
cold treatment on avocado fruit quality
T Grové, M S De Beer and W P Steyn
106 Aspects of water economy of Hass avocado trees (Persea
americana, cv. Hass). I. Plant water status and gas exchange
Y Sharon
110 Mulching and potassium relationships in Hass
avocados to increase yield and fruit size
W van Niekerk, B N Wolstenholme and M A
Johnston
115 Biological and
chemical control of root rot
J A Duvenhage
120 Evaluation of new Hass-like avocado cultivars at Merensky
Technological Services
S Kremer-Köhne