South African Avocado Growers’ Association
1991 Yearbook
Volume 14
Table of Contents
5. Preface
J M Kotzé
6. Suppressive soils and
biological control of Phytophthora root rot
J A Duvenhage, J M Kotzé and Erna M C Maas
12. Observations in an
avocado orchard where chemical control of Phytophthora cinnamomi was
discontinued for two years
J S Köhne and B Kirkman
13. The influence of
calcium on saprophytic growth and pathogenicity of Phytophthora cinnamomi and
on resistance of avocado to root rot
J A Duvenhage and J M Kotzé
15. Yield potential of
intensively managed avocados in the Natal midlands — the early bearing years
B N Wolstenholme, C Kaiser and P Palmer
19. Bepaling van die korrekte
blaarmonster en tyd van monsterneming van Fuerte avokado's vir bemestingsadviesdoeleindes
T J Koen and S F du Plessis
22. Yield and fruit quality
of avocado cv Fuerte as influenced by paclobutrazol foliar applications
Sylvie Kremer- Köhne, J S Köhne and B Kirkman
24. Maturity effects on
avocado postharvest physiology in fruits produced under cool environmental
conditions
J G M Cutting and B N Wolstenholme
27. Preliminary results on
the influence of late hanging of Hass avocados (Persea americana Mill)
on tree performance
A D N Graham and B N Wolstenholme
38. Increasing Hass fruit
size
J S Köhne and J M Schutte
39. Performance of Hass on
three clonal rootstocks
J S Köhne
40. Verband van
vrugkwaliteit met klimaat- en grondfaktore
J J Bezuidenhout and L L Vorster
42. Avocado high density
planting — a progress report
J S Köhne and Sylvie Kremer- Köhne
44. The principles of
temperature management — commercial results
L L Vorster, J J Bezuidenhout and J C Toerien
47. Avokadovruggehalte op
die oorsese mark: vergelyking tussen 1990 en 1989
J J Bezuidenhout
50. Effect of modified
atmospheres on internal physiological browning of Fuerte avocados
A B Truter, J G M Cutting, J P Bower and Sandra J van Eeden
53. 1990 Temperature survey
of export avocados
G J Eksteen and B Henning
56. Progress report —
Difference in fruit ripening and quality from trees with different yield
J G M Cutting and L L Vorster
57. Biological control of
avocado postharvest diseases
Lise Korsten, E E de Villiers, E S de Jager, N Cook and J M Kotzé
60. Verwydering van
roetvlek vanaf avokadovrugte
J J Bezuidenhout
61. Control of preharvest
fruit diseases of avocado. Part I: Efficacy of various Triazole fungicides
against Cercospora spot and Sooty blotch
J H Lonsdale
63. Control of preharvest
fruit diseases of avocado. Part II: A preliminary report on the effects of
spray timing on the incidence of Cercospora spot on avocados in the Burgershall
area
J H Lonsdale and M P Scott
67. Deficiency symptoms in
avocados
R O Barnard, G E B Cillié and J M Kotzé
72. Investigation of the
occurrence of viruses and virus-associated nucleic acids in avocado
Glynnis Cook and L H Nel
74. Parasitoids of the
heart-shaped scale, Protopulvinaria pyriformis (Cockerell) (Hemipthera:
Coccidae) on avocados in South Africa
W J du Toit, Marinda S Schutte and W P Steyn
79. A packhouse survey of
insect damage to avocados in the Nelspruit/Hazyview area during 1990
G B Dennill and M J Erasmus
83. The influence of
Solubor leaf spray on fruit production in avocado
P J Robbertse, A Coetzer and F Bessinger
85. Phomopsis perseae
the cause of trunk canker of Martin Grande avocado
rootstocks in South Africa
M de V van der Merwe and J M Kotzé
87. Evaluasie van
avokado-onderstamme — voorlopige verslag
T Botha
89. Progress report —
Inorganic fertilisation of potted avocado plants: results of pot experiments
R O Barnard
91. Factors important for
optimal irrigation scheduling of avocado orchards
S F du Plessis
94. The avocado industry in
Michoacan, Mexico
J L Aguilera-Montanez
and S Salazar-Garcia
98. Vooroeshantering van
avokado's
Produksiespan, Westfalia