Citrus Nutrition - Leaf Nutrient Analysis
A major problem appears to be that of incorrect nitrogen fertilization which has resulted in imbalanced nitrogen cycling within the trees (Figure 1). Of all the major elements, nitrogen has the most influence on leaf ... [... more]
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Developing New Seedless Citrus Triploid Cultivars
Polyploidy is the condition in which each cell contains three or more sets of chromosomes. This occurs naturally in citrus, often through spontaneous mutations. Changes to the ploidy level of citrus can affect the ... [... more]
HortNET New Zealand |
Silverleaf - How Does The Disease Affect Tree ...
During the 1995/96 growing season, all fruit from 5 pairs of healthy and moderately/ heavily silvered Fiesta apple trees were picked, measured and weighed. For this purpose, a "light" tree means silvering is not ... [... more]
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Non-Chemical Treatments For The Prevention Of ...
Scald develops in a similar way in both warmed and unwarmed fruit, although the actual development occurs earlier in the unwarmed fruit. Therefore, warming treatments have the potential for reducing the incidence of ... [... more]
HortNET New Zealand |
New Zealand Citrus Budwood Scheme : The 1995 Season
Percentage bud take and budbreak. Percentage bud take and budbreak in the 1994 season for some cultivars was lower than that usually expected by some propagators. In order to address this problem we had Dr Bill ... [... more]
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Silverleaf Fungus (C. Purpureum) Hydrolase Activity In ...
These substances degrade cell walls of leaves and fruit, while little apparent degradation of woody tissue occurs. This implies that the fungus targets pectic rather than cellulosic components of cell walls. Damage ... [... more]
HortNET New Zealand |
Integrated Fruit Production In Canterbury (Pest Control)
The major pests - leafrollers and codling moth - can be successfully controlled with three or four Mimic sprays. Predatory mites will successfully control plant-feeding mites. Other pests - woolly apple aphid, apple ... [... more]
HortNET New Zealand |
Silverleaf: Wound Infection, Wound Protection
Wounds become more resistant to infection by the silverleaf fungus with time due to wound healing processes and competition from other micro-organisms which colonise wound tissues. The duration of the wound ... [... more]
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Disease Management Systems For Grapes
The canopy porosity influences the amount of disease within the crop. The porosity of a canopy has a considerable influence on light, spray penetration and air circulation. Increased air circulation reduces relative ... [... more]
HortNET New Zealand |
Research Into Pest Monitoring In An Integrated Fruit ...
Most growers are familiar with the pheromone sticky traps which are readily available for monitoring of codling moth and leafroller. Now commercial pheromones are available for the noctuid moth, Graphania mutans, and ... [... more]
HortNET New Zealand |
How Do Rootstocks Affect Canopy Development?
Citranges are now amongst the most important citrus rootstocks in the world, and six different selections have been included in rootstock evaluation trials at Kerikeri for satsumas and lemons. Further rootstock and ... [... more]
HortNET New Zealand |
Pesticide Residues - Finding Out More And More About ...
OC residues are detectable in most of our estuarine areas and are bioconcentrated in shellfish and other biota in these ecosystems. The levels are not particularly high by international standards except in localised, ... [... more]
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