Avocado and PandA - Trial Results
Bundaberg, Central Queensland.
A trial co-ordinated by John Leonardi, Project Officer with Avocados Australia using Panda as a foliar spray on avocados demonstrated its potential to improve the disease resistance and post harvest keeping quality of avocados.
In this trial PandA tended to enhance the grower's normal applications of Norshield only.
Objectives: To identify the effect of treatment on shoot growth, tree health, fruit yield and quality.
Treatments:
Untreated control, foliar treatments of Panda @ 1:250 or 40 ml/10L (blue/orange) and Panda @ 1:500 or 20 ml/10L (orange) - applied at monthly intervals commenced 21st Jan 2010.
Treatment dates: 21st Jan, 26th Feb, 18th Mar, 15th Apr, 13th May and 10th Jun
Fruit was harvested on the 3rd June 2010
Experimental Layout: 3 treatments x 5 replications in a completely randomised design
Measurements:
1. Yield – total number of fruit, total fruit weight (kg) and mean fruit weight (kg)
2. Dry matter percentage was determined from 3 fruit sampled at harvest from each tree for each treatment
3. Fruit quality assessments – one tray of fruit (20 fruit per tray) per tree from 5 trees (total 15 trays per treatment)
Results:
Table 1 Effect of treatment on yield (number of fruit and total fruit
weight), mean fruit size and dry matter percentage of the fruit at the time of
harvest in 3 year Hass avocado trees grown in Central Queensland
|
Treatment |
No. of
Fruit |
Total
Fruit Wt. (kg) |
Mean Fruit
Size (g) |
Dry matter
% at harvest |
|
Grower (Norshield at 3-4 week
intervals) |
47.2 |
13.8 |
302.2 |
26.9 |
|
Grower + Panda @ 20ml/10L |
48.4 |
13.9 |
307.4 |
26.3
|
|
Grower + Panda @ 40ml/10L |
44.4 |
12.7 |
310.7 |
27.0 |
|
|
|
|
|
|
Table 2 Effect of treatment on the days to eating soft (DTES) and the
percentage of flesh affected with stem-end rots, vascular browning and body
rots in fruit harvested from 3 year Hass avocado trees grown in Central
Queensland. Values are the means 60 fruit for each treatment (20 fruit sampled
from 3 trees of each treatment).
|
Treatment |
DTES |
Stem rots |
Vascular
browning |
Body rots |
|
Grower (Norshield at 3-4 week
intervals) |
8.6 |
5.1 |
4.1 |
7.0 |
|
Grower treatment + Panda @ 20ml/10L
|
8.0 |
5.3 |
3.4 |
5.1 |
|
Grower treatment + Panda @
40ml/10L |
8.3 |
3.2 |
2.5 |
5.7 |
|
|
|
|
|
|
Table 3 Effect of treatment on the percentage of fruit affected with
stem-end rots, vascular browning and body rots in fruit harvested from 3 year
Hass avocado trees grown in Central Queensland. Values are the means 60 fruit
for each treatment (20 fruit sampled from 3 trees of each treatment).
|
Treatment |
Stem rots |
Vascular
browning |
Body rots |
|
Grower (Norshield at 3-4 week
intervals) |
60.0 |
66.7 |
80.0 |
|
Grower treatment + Panda @ 20ml/10L
|
60.0 |
51.7 |
78.3 |
|
Grower treatment + Panda @ 40ml/10L |
48.3 |
45.0 |
83.3 |
|
|
|
|
|
Table 4 Effect of treatment on the percentage of fruit affected with
10% or more of the flesh affected by stem-end rots, vascular browning and body
rots in fruit harvested from 3 year Hass avocado trees grown in Central
Queensland. Values are the means 60 fruit for each treatment (20 fruit sampled
from 3 trees of each treatment).
|
Treatment |
Stem rots |
Vascular
browning |
Body rots |
|
Grower (Norshield at 3-4 week
intervals) |
25.0 |
23.3 |
36.7 |
|
Grower treatment + Panda @ 20ml/10L
|
33.0 |
18.3 |
26.7 |
|
|
18.3 |
6.7 |
30.0 |
|
|
|
|
|
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