A field experiment was conducted in 1991 and repeated in 1992 to compare the use of carbofuran and field drainage as tactics for control of rice water weevil, Lissorhoptrus oryzophilus Kuschel, and to examine the effect on yield of rice (Oryza sativa L.) caused by 1- to 3-d delay in reflooding after drainage. Results showed that, although timely draining of fields significantly reduced immature weevil populations, the tactic was not always reliable nor economical. Reinfestation by rice water weevil populations after drained fields are reflooded can nullify the benefits derived from drainage. Grain yields were not affected by delayed reflooding of fields.
Rice seed treated with pirimiphos-ethyl significantly reduced the infestation of Lissorhoptrus oryzophilus Kuschel. The optimum dose appeared to be 8oz AI/cwt since it provided highly satisfactory control of larvae that resulted in an increased yield of grain equal to the higher rates and at the same time showed more consistency among trials than the lower rates. An encapsulated formulation provided slightly better control with longer residual effects than emulsifiable concentrate and seed dressing formulations. The 8 oz rate of encapsulated formulation reduced larval infestation as much as 94% up to 58 days after flooding the rice seedlings. Rice seedlings protected by the 8 oz encapsulated pirimiphos-ethyl seed treatment in 1971 trials had almost twice as much root mass, 26% greater vegetative dry weight, and were 8% taller with 76% more tillers. In 6 trials of 1971–72, the 8-oz rate yielded a mean of 571 lb (range 383–855) more rough rice/acre than the untreated check.
Journal Article Evaluation of Insecticidal Sprays for Controlling the Rice Stinkbug in Southwest Louisiana Get access B. F. Oliver, B. F. Oliver Search for other works by this author on: Oxford Academic PubMed Google Scholar J. R. Gifford, J. R. Gifford Search for other works by this author on: Oxford Academic PubMed Google Scholar G. B. Trahan G. B. Trahan Search for other works by this author on: Oxford Academic PubMed Google Scholar Journal of Economic Entomology, Volume 65, Issue 1, 1 February 1972, Pages 268–270, https://doi.org/10.1093/jee/65.1.268 Published: 01 February 1972 Article history Received: 26 April 1971 Published: 01 February 1972
Abstract Furadan and Payload were evaluated for control of rice water weevil at the Rice Research Station, Crowley, LA. Plots, 1.22 × 7.5 m, were individually leveed and arranged in a RCBD with 4 replicates and 4 treatments. Fertilizer was incorporated pre-plant and applied broadcast 3 wk post-flood at 50.6 kg (13-13-13) and 101.2 kg (21-0-0) N-P-K/ha respectively. Plots were drill seeded (17.5 cm row spacing) to Crowley silt loam with ‘Cyprus’ rice at 112.5 kg seed/ha on 12 May, flush irrigated 14 and 21 May, and permanently flooded 28 May. Propanil was applied at 3.34 kg/ha on 26 May using a CO2 backpack sprayer delivering 141.9 liters/ha at 1.8 kg/cm2 for weed control. Benomyl was aerially applied at 0.56 kg/ha on 28 Jun to control rice blast. Furadan 3G was applied 15 d post-flood using a hand-held shaker. Payload 15G was applied 15 d post-flood and at 2.95 kg/ha 15 and 29 d post-flood. Two randomly selected soil samples per plot were taken every 7 d starting 9 Jun and ending 21 Jul using a 10.2 × 10.2 cm core sampler. Individual samples were washed through a funnel, fitted with wire screen, into a 35 mesh screen sieve. Collected RWW larvae and pupae were floated in a saturated NaCl solution, counted and corrected for the number of rice plants per core. Effects of pesticide treatment on numbers of immature RWW were determined by ANOVA using orthogonal contrasts to separate the following mean comparisons: 1) Untreated vs Treated; 2) Furadan 3G vs Payload 15G applied once at 5.9 kg/ha and Payload applied twice a 2.95 kg/ha/application date; (3) Payload 15G applied once at 5.9 kg/ha vs Payload applied twice at 2.95 kg/ha/application. Because no significant differences in larva numbers were found among the Payload treatments, these were pooled and the following contrasts made: 1) Untreated vs Treated; 2) Furadan 3G vs Payload 15G. Analysis was performed using larval counts corrected and uncorrected for the number of plants per core, since these analyses produced similar results, only uncorrected means are presented in the table. All analyses were conducted at the 0.05 probability level.
Journal Article Ultra-Low-Volume Insecticides to Control the Rice Stink Bug in Southwest Louisiana Get access B. F. Oliver, B. F. Oliver Search for other works by this author on: Oxford Academic PubMed Google Scholar J. R. Gifford, J. R. Gifford Search for other works by this author on: Oxford Academic PubMed Google Scholar G. B. Trahan G. B. Trahan Search for other works by this author on: Oxford Academic PubMed Google Scholar Journal of Economic Entomology, Volume 64, Issue 4, 1 August 1971, Pages 981–983, https://doi.org/10.1093/jee/64.4.981 Published: 01 August 1971 Article history Received: 28 October 1970 Published: 01 August 1971
Journal Article Reaction of Selected Rice Lines to Stalk Borers Get access B. F. Oliver, B. F. Oliver Baton Rouge, Louisiana Search for other works by this author on: Oxford Academic PubMed Google Scholar J. R. Gifford, J. R. Gifford Baton Rouge, Louisiana Search for other works by this author on: Oxford Academic PubMed Google Scholar G. B. Trahan G. B. Trahan Baton Rouge, Louisiana Search for other works by this author on: Oxford Academic PubMed Google Scholar Journal of Economic Entomology, Volume 66, Issue 3, 1 June 1973, Pages 794–796, https://doi.org/10.1093/jee/66.3.794 Published: 01 June 1973 Article history Received: 03 October 1972 Published: 01 June 1973
