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Efficacy of New Miticide Products on Citrus Rust Mite , 1999
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P. A. Stansly, J. M. Conner, B. M. Cawley and D.R.A Peach
University of Florida/IFAS
Southwest Florida Res. and Ed. Center
ORANGE: Citrus sinensis (L.) Osbeck ‘Hamlin’
Citrus rust mite (CRM): Phyllocoptruta oleivora (Ashmead)
Citrus rust mite (CRM) continues to be the major arthropod pest of citrus in Florida. The objective of this trial was to test miticide products against a present standard, Vendex. The trial was conducted at the Silver Strand North Grove, Collier County, Florida, on 8-year old ‘Pineapple’ orange trees planted at 12 ft tree X 24 ft row spacing. An RCB design was used with 4 replications and 6 treatments including an untreated check. Each replicate was a single row with a 2-row unsprayed buffer between reps and a 6-tree buffer between each plot in the rep. A pre-count made 25 Oct from 64 lens fields on 32 fruit from 8 trees per replication produced an mean of 4 CRM s = 3 per standard 10x lens field. Treatments were applied on 28 Oct using an
air blast speed sprayer with seven ceramic HC Albuz™ nozzles, in an array of 2 red and 5 blue per side, at a pressure of 300 psi which delivered 125 gpa. Treated trees were sprayed from both sides. Control trees were sprayed with water. Sunspray 9E oil was tank mixed with the 2 experimental compounds at 3 % v/v. KNO3 was tank mixed with Vendex for one treatment. Sampling was conducted on 2, 17 and 30 Nov and 15 Dec from 4 trees in the middle of each 10 tree plot with 4 fruit, 2 per side, removed from each tree. All live CRM were counted in two lens fields of each fruit in 1.5-cm diameter fields using a 10x Bauch and Lomb® Hastings triplex lens on the partially shaded side of each fruit. Data on CRM counts were analyzed without transformation using Anova with mean separation
by LSD.
Mite populations in the control decreased sharply the last 2 evaluations.. There were significant differences between treatments and the control until the last evaluation at 48 days. There was no significant differences observed between acaricide treatments.
Florida Agricultural Experiment Station Journal Series No. N-02007
|
Treatment/
formulation |
Rate
amt form/acre |
Mean number CRM per lens field |
|
2 Nov |
17 Nov |
30 Nov |
15 Dec |
Over all dates |
|
GX00644-001 +
Sunspray 9E oil |
4 oz 3 % v/v |
4.28b |
8.22b |
5.32b |
2.91a |
5.18b |
|
GX0644-002 +
Sunspray 9E oil |
4 oz 3 % v/v |
5.66b |
6.13b |
7.22b |
5.25a |
6.07b |
|
Vendex 50 WP |
2 lb |
6.63b |
5.66b |
3.94b |
3.53a |
4.94b |
|
Vendex 50 WP |
3 lb |
6.03b |
4.85b |
6.10b |
4.66a |
5.41b |
|
Vendex 50 WP
+ KNO3 |
2 lb
25 lb
|
3.60b |
4.16b |
4.53b |
5.94a |
4.56b |
|
Untreated check |
|
19.57a |
19.22a |
10.72a |
4.38a |
13.47a |
| Means in columns followed by the same letter are not significantly different (LSD, P<0.05) |
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