South African Avocado Growers’ Association

2007 Yearbook

Volume 30

Table of Contents

POSTHARVEST

7          Extending the storage life of late season ‘Hass’ avocados to increase the availability of pre-packed ready-to-eat fruit during the off-season
D Lemmer, T R Malumane, J Ntandane and F J Kruger

12        Commercial ripening trials with South African avocados in the United Kingdom
F J kruger and D Lemmer

17        Antioxidants in ‘Hass’ avocado
I Bertling, S Z Tesfay and J P Bower

HORTICULTURE

21        Effect of different mulch materials, composts and organic treatments on tree condition and root health
Z Mavuso and A Willis

26        Occurrence of excessive leaf abscission of the avocado cultivar Ryan: Possible causes and prevention
N J R Roets, S de Meillon, P J Robbertse, J H Owen and R Ehlers

ROOTSTOCKS AND CULTIVARS

32        Evaluation of the Hass-like avocado cultivars Harvest, Gem and Grace
A T Bruwer

PATHOLOGY

34        Alternative control of Cercospora spot on ‘Fuerte’ – Progress report
A Willis

39        Efficacy of water soluble potassium silicate against Phytophthora root rot of avocado under field conditions
T F Bekker, N Labuschagne, T Aveling and C Kaiser

49        The inhibition of Phytophthora root rot of avocado with potassium silicate application under greenhouse conditions
T F Bekker, N Labuschagne, T Aveling and C Kaiser

57        Accumulation of total phenolics due to silicon application in roots of avocado trees infected with Phytophthora cinnamomi
T F Bekker, N Labuschagne, T Aveling, C Kaiser and T Regnier

PHYTOSANITARY

66        The feasibility of a hot water treatment for South African avocados (Persea americana [Mill.] cv Hass)
R J Blakey and J P Bower