ontario sugar beet growers - Atrium - University of Guelph

CROP: Sugar beet (Beta vulgaris L.) cv. El 7
PEST:
Imported cabbageworm, Artogeia rapae (L.)
Tarnished plant bug
NAME AND AGENCY:
PITBLADO, R E
Ridgetown College, University of Guelph, Ridgetown, Ontario, NOP 2C0
Tel: (5 19) 674-1 605 Pax: (5 19) 674- 1600 E-mail: rpitblad@ridgetownc.uoguelph.ca
TITLE:
GREEN STREME 930 FOR THE PROMOTING OF VIGOUR AND THE
CONTROL OF INSECTS IN SUGARBEETS-2005
MATERIALS: GREEN STREME (experimental)
METHODS: Sugarbeets were planted at the research station in Ridgetown on May 9,2005. Two-row
plots were established, 7m in length with rows spaced 0.75m apart, replicated four times in a randomized
complete block design. The foliar applications were applied using a specialized small plot research CO,
sprayer with a three nozzled hand-held boom applying 200Lha of spray mixture. Spray applications were
applied on May 26 at the two leaf stage and on July 22 at fill leaf cover. Plant vigour ratings were taken
on June 14 while the foliar insect feeding damage assessments were made on August 3 by counting the
number of leaves with leaf feeding holes caused by insect feeding. Yields were taken at harvest on
October 4. Representative beet root samples were sent away to have laboratory sugar analysis conducted
by the Michigan Sugar Company. Results were analysed using the Duncan's multiple range test (Ps
0.05).
RESULTS: Data are presented in Table 1.
CONCLUSIONS: GREEN STREME 930 had no influence in plant vigour throughout the season nor
did it have any effect in reducing the number of foliar feeding insects in sugarbeets. Yields and the
number of beets harvested were not affected. The results of the sugar testing has not yet been completed.
Table 1. Plant foliar vigour ratings, insect leaf feeding damage and yields in sugarbeets.
Treatments
# leaves with
Plant Vigour Yield # beets
insect feeding
Rate Ratings (0-10) "
kglplot harvested
Product1
holes
ha
June 14 August 3 October 4 October 4
GREEN STREME 930 7.5 1 8.3 a* 19.5 a 21.85 a 39.0 a
CONTROL 8.3 a 23.0 a 27.30 a 48.0 a
--
ANOVA P50.05
Coefficient of Variation (%)
*These values are the means of four replications. Numbers within a column followed by the same small
letter are not significantly different according to a Duncan's Multiple Range Test (Ps0.05).
11 Plant Vigour Ratings (0-10) - 0 plants in poor health, 10- plants in excellent health.