2007 - Texas A&M AgriLIFE Research Center at Beaumont - Texas ...

Table 19. Insecticides for rice water weevil control (continued).
zeta-cypermethrin
• Mustang MAX kills adults, which prevents egg laying. Thus, timing of Mustang MAX is critical for control. Texas data show
applications later than 10 days after permanent flood are ineffective.
• Zeta-cypermethrin does not interact with propanil.
• Do not release treated water within 1 week of application.
• Do not apply more than 0.1 lb a.i. per acre per season.
• Do not use treated rice fields for aquaculture of edible fish and crustaceans.
• Do not apply within 14 days of harvest.
• Do not enter treated field for 12 hours after application.
For additional information on the above products, read the labels or contact the Texas Agricultural Experiment Station at 409.752.2741.
Chinch bug
(Blissus leucopterus leucopterus)
Identification, biology and damage
Chinch bugs overwinter as adults. They are black, about
1
⁄8- to 1 ⁄6-inch long and elongate about three times longer
than wide. When viewed from above, the adult appears to
have a white “x” on its back. Females are larger than males.
These insects have piercing-sucking mouthparts, which
they insert into the food-conducting tissues of plants and
withdraw fluids. If you turn the insect on its back, you can
see the long, strawlike mouthparts usually held between its
legs.
Adults overwinter and can move into fields after the rice
emerges. Females lay elongate orange eggs about 1 ⁄16-inch
long on rice stems, between leaf sheaths and stems, and in
the soil. In the spring, eggs typically hatch in about 12 days.
First-instar nymphs are orange and about 1 ⁄16-inch long.
Five instars (stages) are completed in about 40 days with
each successive instar being larger and darker. The last
instar is black, has conspicuous wing pads and is almost as
large as the adult.
Newly emerging rice is most susceptible to damage and
death. Symptoms of chinch bug damage include striping,
stippling and yellowing of leaves. Severely affected seedlings
turn brown and die.
Inspect the rice often for chinch bugs from emergence to
about 3 weeks later. Look for adults on foliage and behind
leaf sheaths; then inspect the stem; and finally probe the
soil around the plant. Also, bend the seedling from side to
side and closely inspect the gap between soil and stem for
chinch bugs.
Recent Texas data show that as few as an average of
one chinch bug per two seedlings can cause significant
mortality in rice, as well as reduction in height and delay in
maturity of the surviving plants. If populations on seedling
rice approach an average of one adult per two plants, quick
control is suggested.
Table 20. Insecticides for chinch bug control.
Active ingredient/product
carbaryl
Sevin ® 50W
Sevin ® 80WSP
Sevin ® 80S
Sevin ® XLR
Sevin ® 4F
Active ingredient
1.0–1.5 lb
1.0–1.5 lb
1.0–1.5 lb
1.0–1.5 lb
1.0–1.5 lb
Rate per acre
Product
2–3 lb
1 1 ⁄4 – 1 7 ⁄8 lb
1 1 ⁄4 – 1 7 ⁄8 lb
1–1 1 ⁄2 qt
1–1 1 ⁄2 qt
Timing of applications
Apply when adult populations approach an average of one per
two seedlings.
gamma-cyhalothrin
Prolex 0.0125–0.02 lb 1.28–2.05 fl oz Apply when adult populations approach an average of one per
two seedlings.
lambda-cyhalothrin
Karate ® Z 0.025–0.04 lb 1.6–2.56 fl oz Apply when adult populations approach an average of one per
two seedlings.
zeta-cypermethrin
Mustang MAX 0.0165–0.025 lb 2.64–4.0 fl oz Apply when adult populations approach an average of one per
two seedlings.
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