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Everglades Station Mimeo 62-21
ay 1962
Control of Wireworms, Sweet Corn Insects, and Celery Insects
Emnett D. Harris, Jr.
The results shown in this report are not intended as insect control
recommendations. One should refer to Florida Agriculture Extension Circular
193B or consult the County Agent, Experiment Station Entomologist, or the
Insecticide Label for insect control recommendations.
WIREWORM CONTROL
Insecticides were applied broadcast on October 25, 1961 and immediately
disked into the soil. Florigold sweet corn was planted on November 8, 1961.
A total of 16 plants per week per treatment and the surrounding soil were
examined for 7 weeks for wireworms.
Experiment I
Insecticide Treatment
Diazinon Spray
Parathion Spray
Heptachlor Spray
Telodrin Spray
Untreated
Lbs. Act.
per acre
4
4
4
0.8
Wireworms/
100 plants
1
3
13
8
15
1,000 plants
per acre .
December 5 /
27.6 /
25.7
26.1 i
24.7
26.0
Experiment II
Insecticide Treatment
Lbs. Act.
per acre
Wireworms/
100 plants
Aldrin Spray 4
Chlordane Spray 6.5
Kepone 5% Corn Meal Bait 5 .
Aldrin 25% Granules 5
Untreated
1,000 Plants
per acre
December 5
27.4
25.2
31.0
25.5
24.6
SWEET CORN INSECTS
Corn Stem Weevil Control
Experiment I Comparison of Insecticides and DDT Formulations.
Sprays were applied on August 22, 26, 30, and Sept. 3, 1961, to Florigold
106 sweet corn planted on August 18 and emerged on August 22, 1961.
Insecticide and Amount per 100 Gal,
% Plants
Corn Stem
weevil
Sept. 3
Damaged by:
Budworms
Sept. 13
1,000
Plants/acre
Sept. 14
DDT 25% EC, 1 gallon
DDT 50% WP, 8 Ibs.
DDT 50% wP, 8 lbs. & Triton X-100, 8 oz.
R1504 (4 Ibs/gal) EC, 2 qts.
ASP-51 (4 Ibs/gal) EC, 2 qts.
Untreated Check
23.2
23.9
23.6
23.3
20.0
21.0
Experiment II Weed Control and Number of DDT Applications for Corn Stem
Weevil Control.
Florigold 106 sweet corn was planted on August 18 and emerged on August
22, 1961. Insecticide sprays for corn stem weevil control contained 1 gallon
of 25% DDT EC per 100 gallons and were applied at approximately 100 gallons
per acre.
Weed Control
Number of DDT
Applications & Date
V Corn Stem
Weevil Mined
Plants
Sept. 11
Crates/A.
U.S.Fancy
Oct. 23
Chemical
3 lbs. Randox
S2 lbs. Vegedex
per acre Aug.
Mechanical
Tillivation
Aug. 29
Shovels
Sept. 6
No Weed Control
None
2 Aug 22, 26
18 4 Aug 22, 26, 30, Sept. 3
6 Aug 22, 26, 30, Sept 3, 7, 11
None
2 Aug
4 Aug
6 Aug
None
2 Aug
4 Aug
6 Aug
26
26, 30, Sept 3
26, 30, Sept 3, 7, 11
30, Sept 3
30, Sept 3, 7, 11
116
103
167
158
133
137
150
159
105
122
145
155
Corn Earworm Control
Experiment I DDT and Sevin for Earworm Control
Insecticides applied to Florigold 106 sweet corn at 2-day intervals from
October 2 to October 18, 1961. Sprays at 40 to 50 gallons per acre.
First silks: October 1. Harvest: October 23.
Insecticide Lbs. Act. Txc.
formulation per 50 gals. % Worm-free ears
DDT 25% EC 2 49
Sevin 85% WP 2 65
Untreated 1
CELERY INSECT CONTROL
Experiment I Non-Systemic Insecticides and Frequency of Application
Utah 52-70 celery transplanted to the field on November 22, 1961.
Sprays applied from December 7 to February 15 at weekly and twice
weekly intervals. Sprays were begun at 75 gallons per acre and
increased to 150 and then to 200 as the celery grew larger.
Living Leaf Miners per 100 Leaflets
Lbs. Avg. of 6 Counts
Act. 1-2 days 4-6 days February 21 March 1
Txc. after after 6 days after 14 days after
/100 twice weekly Final spray Final spray
Gals. weekly appls. Twice Twice
appls. Weekly Weekly Weekly Weekly
Guthion 0.5 2 6 0 10 18 23
Diazinon 0.5 7 23 5 23 10 40
Vapona 1.0 18 55 55 25 80 43
Dibrom 1.0 16 75 45 40 60 48
Parathion 0.25 70 101 45 23 23 30
Untreated 96 111 28 31 44 45
Experiment II Non-Systemic Insecticides and Frequency of Application
As experiment I except that the final spray was on February 8.
Living Leaf Miners per 100 Leaflets
Ibs. December 20 January 10
Act. 1 day 4 days 2 days 5 days
Txc. after last after last after last after last
/100 twice weekly weekly twice weekly weekly
Gals. application application application application
Endrin 0.2 125 143 250 435
Thiodan 0.5 213 143 479 435
Delnav 1.0 255 245 775 745
Phosdrin 0.25 48 105 115 315
Parathion 0.25 188 155 165 375
Untreated 103 125 268 340
Number of Green
/100 Leaflets -
Twice weekly
sprays
Peach Aphids
Avg. of 3 Dates
Weekly
sprays
Endrin
Thiodan
Delnav
Phosdrin
Parathion
Untreated
0.2
0.5
1.0
0.25
0.25
Experiment III Systemic Insecticides and Frequency of Application.
Utah 52-70 celery was transplanted to the field on November 22, 1961.
Sprays were applied from December 7 to February 8, 1962 at one week and two
week intervals. Sprays were begun at 75 gallons per acre and increased to
150 and then to 200 as the celery grew larger. Leaf miner counts were made
weekly.
NUMBER OF LIVING LEAF
Avg. of 5 counts made 4-7
days after 1 week interval
and 11-14 days after 2
week interval sprays
One week Two week
interval interval
MINERS PER 100 LEAFLETS
Avg. of 5 counts made 4-6
days after both 1 week and
2 week interval sprays
One week Two week
interval interval
Dimethoate
MetaSystox
Phosphamidon
SD 3562
SD 3562
Untreated
EES Mimeo 62-21
350 copies
Lbs.
Act.
Txc.
/100
Gals.
Lbs.
Act.
/100
Gals.
0.5
0.5
1.0
0.25
0.50
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