South African Avocado Growers’ Association

1993 Yearbook

Volume 16

Table of Contents

1        Voorwoord
J M Kotz
é

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 Kotz
é

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

103     The status of greenhouse thrips, Heliothrips haemorrhoidalis and red-banded thrips, Selenothrips rubrocinctus (Thripidae), on avocado fruits in the Hazyview region of the eastern Transvaal
F M A Dupont

105     Natural enemies of thrips on avocado
W P Steyn, W J
du Toit and Marinda S de Beer

107     An ecological study of and development of a monitoring technique for the damage done to avocado fruits by Hemiptera in the Hazyview region of South Africa
F M A Dupont

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