South African Avocado Growers’ Association
1993 Yearbook
Volume 16
Table of Contents
1 Voorwoord
J M Kotzé
2 The role of Boron in
avocados: Theory, Practice and Reality
L A Coetzer, P J Robbertse & B P H Janse van Vuuren
5 Cuke development in
consistently low producing trees of the 'Fuerte' avocado with special reference
to seed abortion
E M A Steyn, P J Robbertse and D G Smith
9 Cryptically Female
flowers in ‘Fuerte’: Fact or fallacy?
E M A Steyn
18 Progress report on
avocado tree size control by means of bark manipulation, dwarfing interstocks
and rootstocks
J S Köhne and J M Schutte
20 The cytokinin complex
as related to small fruit in 'Hass' avocado
J G M Cutting
22 Vascular and
associated tissue of 'Hass' avocado (Persea americana Mill.) fruit
C Kaiser
28 Horticultural
performance of imported cultivars and rootstocks in the north-eastern Transvaal
D G Smith
31 Effect of CPPU sprays
on yield and fruit size in avocado cv Hass
J.S. Köhne, Sylvie Kremer-Köhne and J M Schutte
33 Effect of potassium,
magnesium and nitrogen soil applications on Fuerte avocado fruit quality
Sylvie Kremer-Köhne,
J S Köhne and J M Schutte
37 Notes on foraging
activity of honeybees in an avocado orchard
A P du
Toit and D. Swart
39 Aspects of late hung
'Hass' avocado (Persea americana Mill.) fruit in the Natal midlands I.
Fruit lipid and fatty acid accumulation
C Kaiser and B N Wolstenholme
46 Aspects of late hung
'Hass' avocado (Persea americana Mill.) fruit in the Natal midlands II.
Fruit lipid and fatty acid accumulation
C Kaiser and B N Wolstenholme
56 Temperatuurbestuur van
uitvoer avokado's gedurende 1992
J J Bezuidenhout
59 Orchard microclimate
as modified by windbreaks: A Preliminary Investigation
M Holmes and D Farrell
65 Progress report on Biocontrol
of avocado diseases
Lise Korsten, E E de Villiers,
A Rowell and J M Kotzé
70 Biocontrol of root rot
of avocado seedlings
J A Duvenhage and J M Kotzé
73 The effect of
Phosphite in rooted cuttings of Duke 7 avocado on Phytophthora cinnamomi
M de V. van der Merwe
75 The influence of organic
amendments and discontinuation of chemical root rot control on tree condition
and yield of avocado
J A Duvenhage, J.S. Köhne
& B. Kirkman
77 The influence of wet
picking on post harvest diseases and disorders of avocado fruit
J A Duvenhage
80 Progress with the
single tree management concept
D G Smith, J S Köhne and J M Schutte
82 Carbohydrate and other
studies on alternate bearing Fuerte and Hass avocado trees
Martie van der Walt,
S J Davie and D G Smith
86 Avocado breeding: A
progress report
Zelda Bijzet, A D Sippel and P J J Koekemoer
90 Analysis of
'Pinkerton' avocado fruit growth
A D Sippel, M A Holmes, N J F Claassens and Valerie Claassens
96 Die rol van fisiese
eienskappe van grond by die verboulng van avokado's
J J Broekman
100 Occurrence of protrusions
on avocado fruit and the causative agent
W J du
Toit, W P Steyn and Marinda
S de Beer
105 Natural enemies of thrips
on avocado
W P Steyn, W J du Toit and
Marinda S de Beer
113 The role of two
insecticides in controlling insect pests of avocados
C Erichsen and A S Schoeman
116 Effect if insect growth
regulator, CGA211446, on the third instar of the heart-shaped scale on avocados
W P Steyn, W J du Toit and
E A de Villiers
118 Invasion of orchards by
the avocado beetle Monolepta apicalis (Sahlberg) (Coleoptera: Chrysomilldae) assessment of damage to leaves and fruit
C Erichsen, M A McGeoch and A S Schoeman
123 Monolepta apicalis (Sahlberg) (Coleoptera: Chrysomelidae): A new addition to the avocado pest-complex
C Erichsen and A S Schoeman
125 Comparison of and
scouting for beetles and looper damage to avocado leaves and fruit
C Erichsen
127 Preliminary report on
the natural occurrence of insect pollinators in an avocado orchard
C D Eardley and M W Mansell