AGRO 3503, Rice Production: Weed and Disease Management, Unit III-4, 20 pts.

1. The number one weed problem in rice is:

A. red rice B. barnyardgrass

C. hemp sesbania D. sprangletop

2. The most common weed in rice is:

A. red rice B. barnyardgrass

C. hemp sesbania D. spangletop

3. The optimum time to apply propanil for barnyardgrass control is:

A. just after flooding B. before emergence

C. when weeds are 1-3 leaf D. when weeds are 5-7 leaf

4. Which of the following strategies might one use to control propanil-resistant

barnyardgrass?

A. Command or Facet at early postemergence

B. Ordram at flooding

C. Grandstand at delayed preemergence

D. 2,4-D at mid-season post-emergence

5. Which of the following would be best for controlling N. jointvetch?

A. Propanil early B. Propanil + Bolero early

C. Prowl delayed pre D. Command delayed pre

6. Which of the following has the best control of broadleaf signalgrass?

A. Ordram ppi B. Bolero, delayed pre

C. Command, pre D. Prowl, delayed pre

7. Which of the following herbicides does NOT provide residual control of weeds?

A. Prowl B. Grandstand

C. Command D. Facet

8. Which of these herbicides would be better for control of aquadic weeds?

A. Londax B. Propanil

C. Command, pre D. Facet

9. A package mix of Basagran + Blazer herbicides is marketed under the name:

A. Bicep B. Storm

C. Touchdown D. Sutan +

10. Label the following:

A – barnyardgrass B – red rice

C – broadleaf signalgrass D – loosehead sprangletop

11. Rice diseases are estimated to cause annual yield losses of:
A. 1-2% B. 8-10%

C. 10-20% D. 40-50%

12. The most common disease in Arkansas rice fields is:

A. kernel smut B. sheath blight

C. brown spot D. stem rot

13. The organism responsible for straighthead disease in rice is:

A. Rhizoctonia solanii B. Ustilaginoidea virens

C. Cercopsora tritici D. unknown physiological cause

14. Initial symptoms of blast disease are:

A. distorted seeds B. small brown spots

C. spindle to oval shaped leaf lesions D. water marks on leaf sheaths

15. A good fungicide for kernel smut disease is:

A. Tilt B. Quadris

C. Grandstand D. Benelate

16. Sheath blight infestation is NOT enhanced by:

A. high N fertilization rates B. thick stands

C. hot, humid weather D. hot, dry weather

17. The proper time to apply Quadris fungicide for nect blast control is:

A. at 50% boot B. at 50% heading

C. at 5-7 leaf D. as a seed treatment

18. Stem rot disease can be a problem in:

A. low K test soils B. high K test soils

C. early planted rice D. no-till planted rice

19. Control of straighthead disease is accomplished by:

A. Quadris at early boot B. Tilt at 50% heading

C. planting early D. draining and drying of fields

20. A rice variety exhibiting high resistance to sheath blight is:

A. Drew B. Cocodrie

C. Wells D. there are none