ADDITIONS IN LAST 30 DAYS
Documents 1 to 10 of 84 added in the last 30 days.
The dissemination of fungal pathogens on avocado trees in South Africa with reference to vector potential of insect pests
Coertzen, J., De Villiers, Fourie
CoertzenJ2017. 32 SOUTH AFRICAN AVOCADO GROWERS’ ASSOCIATION YEARBOOK 40, 2017 INTRODUCTION Fungal and plant associations have evolved over a long period, making fungi an important group of organisms of which only 10% can colonise living plants. Nevertheless, most plant diseases (70% are caused by fungi. There are approximately 110000 species of fungi described to date and new species are described at a rate of 1200 species per annum (Blackwell 2011; Kirk et al. 2008) Of prime importan
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The correlation between fruit fly numbers trapped and damage levels in avocado orchards
GroveT2017. 64 SOUTH AFRICAN AVOCADO GROWERS’ ASSOCIATION YEARBOOK 40, 2017 ABSTRACT In South Africa, the Mediterranean fruit fly, Ceratitis capitata (Wiedemann) the Marula fruit fly, Ceratitis cosyyr (Walker) the Natal fruit fly, Ceratitis rosa sensu lato Karsch, and the Oriental fruit fly, Bactrocera dorsalis (Hendel) are of economic importance for subtropical fruit production. Studies indicated that the Natal fruit fly comprises a complex of two genotypes and morphotypes that sho
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Further observations on the manifestation of certain physiological disorder variants in 'Hass' and 'Maluma' avocado fruit
Kruger, F.J., Lemmer, D., Ernst, A.A., Snijder, B., Volschenk, E., Volschenk, G.O.
KrugerFJ2017c. 96 SOUTH AFRICAN AVOCADO GROWERS’ ASSOCIATION YEARBOOK 40, 2017 ABSTRACT During a previous presentation, certain hypotheses were formulated regarding the manifestation of a range of physiological disorders afflicting South African ‘Hass’ avocado fruit. One of the disorders, “storage induced internal chilling injury” was attributed to cool storage of a late fruit set that was cultivated under low nitrogen conditions. Further research has, however, refuted the late set cau
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Residue testing of avocado trees treated with phosphorous acidbased trunk injections for the control of Phytophthora cinnamomi
Meyer, J.B., Grobler, M., du Rann, S.
MeyerJB2017. 28 SOUTH AFRICAN AVOCADO GROWERS’ ASSOCIATION YEARBOOK 40, 2017 Phytophthora cinnamomi Rands is an important fungal root disease that causes decay and yield loss in avocado (Persea americana Mill) Phosphorus acid has proved effective at controlling Phytophthora cinnamomi in avocaad orchards. In South Africa, the maximum residue limit (MRL) for phosphorous acid in avocado fruit is set at 50 mg/kg; however, growers have difficulty maintaining this MRL when applying phospho
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Identification of a pheromone blend for the control of stink bug
BothaBM2017. 70 SOUTH AFRICAN AVOCADO GROWERS’ ASSOCIATION YEARBOOK 40, 2017 ABSTRACT This project deals with the two major stink bug pest species found in the subtropical industry: the coconut and two spotted stink bug. Avocado is not a host for the two spotted stink bug and this report will therefore only deal with the coconut stink bug. Identification of a pheromone blend for the control of stink bug BM Botha Tshwane University of Technology, Private Bag X680, Pretoria 0001, SOUTH
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Finding the best polliniser for 'Hass' avocado and the effect of bees as pollinators
Bezuidenhout, M., du Toit, E.S., Robbertse, P.J.
BezuidenhoutJJ2017b. SOUTH AFRICAN AVOCADO GROWERS’ ASSOCIATION YEARBOOK 40, 2017 117 ABSTRACT The study entailed an in vitro pollination study and field trials. The field trials consisted of encaged ‘Hass’ trees with bees, encaged ‘Hass’ x ’Zutano’ trees with bees, open pollinated ‘Hass’ trees and encaged ‘Hass’ trees with no bees inside. For testing the viability of cross pollination with ‘Fuerte’ as a polliniser, fruit set on ‘Hass’ trees at increasing distances from an adjacent ‘Fuerte’
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Growing avocados under shade netting
Stones, W., van Rooyen, Z., Köhne, J. Stefan
StonesW2017. SOUTH AFRICAN AVOCADO GROWERS’ ASSOCIATION YEARBOOK 40, 2017 123 ABSTRACT There is a global trend to high intensity horticulture, including high density plantings, in the use of superior cultivars, greater plant manipulation and protected cultivation. Avocado growers have only recently started usiin protected cultivation and still need to determine the technical details of this type of cultivation. Following on from previous reports published in the SAAGA Yearbook, speci
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Bacterial dynamics and the prevalence of foodborne pathogens associated with avocado fruit Persea americana Mill.
Coetzee, C., du Plessis, E., Duvenage, S., Korsten, Lise
CoetzeeC2017. 36 SOUTH AFRICAN AVOCADO GROWERS’ ASSOCIATION YEARBOOK 40, 2017 ABSTRACT The global demand for fresh produce has increased significantly due to healthier life styles and a growing demand for ready-to-eat food. In this context, an increase of roughly 38% has been reported between 2003 and 2013 in fresh produce consumption. However, the fresh produce industries have also received negative exposure due to associated foodborne related disease outbreaks linking on farm or pac
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Prochloraz – a look into factors affecting the variability of residue levels on avocado fruit
Daneel, M.S., Sippel, A.D., De Beer, M.S., Mlimi, J.
DaneelMS2017. 72 SOUTH AFRICAN AVOCADO GROWERS’ ASSOCIATION YEARBOOK 40, 2017 ABSTRACT The main aim of the study was to determine reasons for significant variation in the residues on fruit when usiin prochloraz as a postharvest treatment. The impact of fruit size, cultivars (Hass’ ‘Ryan’ and ‘Pinkerton’ and standing over of fruit were evaluated, following an improved protocol based on last years’ results. Results showed the highest residue levels were found on small size fruit, cultiv
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Evaluating phosphite concentrations in avocado tree roots following phosphonate applications - Preliminary report
McLeod, A., Novela, P., Masikane, S., Mohale, P., Pieterse, P., Wessels, J.P.B.
McLeodA2017. 42 SOUTH AFRICAN AVOCADO GROWERS’ ASSOCIATION YEARBOOK 40, 2017 ABSTRACT Phosphonates, which breaks down into phosphite in plants, are regularly used for the management of avocado root rot in South Africa. The first aim of the study was to determine in two orchard trials the effect of ammoniiumand potassium phosphonate foliar sprays on root phosphite concentrations, in comparison to phosphonaat trunk injections. The second aim was to survey healthy and declining trees in
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