AGRO 3503, Rice Insects, yield and grain quality. Unit II-5, 20 pts.


1. Rice water weevils begin laying eggs:

A. before rice emerges B. right after flooding

C. just before flooding D. at heading


2. Most of the yield damage from rice water weevils occurs due to:

A. larval feeding on seeds B. larval feeding on roots

C. adult feeding on roots D. adult feeding on leaves


3. The best time to check rice fields for rice water weevil larvae is:

A. in the fall after harvest B. 2-3 weeks after flooding

C. just before flooding D. at 50% boot stage


4. An alternative to insecticide use for rice water weevil control is:

A. increase seeding rates

B. add supplemental foliar K
C. drain and dry fields 10-14 days after flooding

D. plant late


5. An approved insecticide for control of adult rice water weevils is:

A. Karate Z B. Pinnicle

C. Grandstand D. Dimilin


6. Dimilin 2L insecticide is actually:

A. a poly-propanol herbicide B. a transgenic pyrethoid

C. an organic carbamate + pyrethoid D. an insect growth regulator


7. The best time to scout for rice stink bugs is:

A. at night using red lights B. 3-6 p.m. during flowering

C. 8-11 a.m. during heading D. anytime before flooding


8. Rice stink bug feeding damage is most severe to:

A. rice seeds in the milk stage B. rice seeds prior to emergence

C. rice stems at heading D. rice seeds at maturity


9. Fall armyworm larvae cause the most damage from:

A. flag leaf feeding B. seed feeding before emergence

C. seed feeding during heading D. root pruning at flooding


10. The recommended moisture for rice harvest is:

A. 5-10% B. 10-12% C. 17-21% D. 22-26%


11. Whole rice is defined as:

A. 100% whole kernels B. 51%+ kernels

C. 75%+ kernel D. seeds hulls

12. The minimum seed test weight for rice to be U.S. No. 1 grade is:

A. 55 lbs B. 58 lbs

C. 38 lbs D. not considered in rice grading


13. Approximately how much $/acre losses would a 160 bu/acre yielding field of U.S.

No. 4 rice have compared to a 160 bu/acre yielding field of U.S. No. 3 crop?

A. $5/acre B. $12/acre C. $24/acre D. $38/acre


14. You notice excessive loss of rice from the back of the combine. This is most likely

due to:

A. high seed moisture B. overloading the separator

C. low seed moisture D. underloading the thresher


15. For a 1680 Case IH combine, increasing ground speed from just 3 mph to 4 mph

will, on the average, increase harvest losses by about:

A. 4-5% B. 10-20%

C. 1-2% D. will not affect losses


16. List below at least five factors that directly or indirectly affect rice milling yields: