Field Evaluation of Insecticides Against Fall Army Worm Spodoptera Frugiperda (J E Smith) in Sweet Corn

Laboratory cultures of field-collected larval tobacco budworm, Heliothis virescens (F.), beet army worm, Spodoptera exigua (Hübner), and fall armyworm, S. frugiperda (J. E. Smith) were bioassayed for response to three pyrethroids in combination with piperonyl butoxide (PBO), or MGK-264. The greatest synergistic effects were seen in S. exigua which also displayed the greatest tolerance to pyrethroids without synergists. The highest SR50 (synergist ratio) value for S. exigua was 22.1 with fenvalerate-PBO mixed in a ratio of 1:5, the highest for S. frugiperda was 4.6 with fenvalerate-MGK-264 1:5, and the highest for H. virescens was 1.3 with permethrin-MGK-264 1:5 or with fenvalerate-PBO 1:5.

Download Full-text

MORTALITY OF FALL ARMYWORM, SPODOPTERA FRUGIPERDA (LEPIDOPTERA: NOCTUIDAE) EGGS, LARVAE AND ADULTS EXPOSED TO SEVERAL INSECTICIDES ON COTTON

Journal of Entomological Science ◽

10.18474/0749-8004-24.4.563 ◽

1989 ◽

Vol 24 (4) ◽

pp. 563-571 ◽

Cited By ~ 5

Author(s):

J. S. Mink ◽

R. G. Luttrell

Keyword(s):

Spodoptera Frugiperda ◽

Plant Tissue ◽

Fall Armyworm ◽

Insect Growth Regulator ◽

Limiting Factor ◽

First Instar ◽

Biological Insecticide ◽

Heliothis Spp ◽

Lepidoptera Noctuidae ◽

Army Worm

Mortality of eggs, first, third, and fifth instars and adults of fall army worm (FAW), Spodoptera frugiperda (J. E. Smith), after exposure to several insecticides on cotton indicated that the FAW is susceptible to most insecticides currently used to control Heliothis spp. Most insecticides tested exhibited ovicidal activity. High mortality of first instar larvae was observed for most treatments, including the biological insecticide, Bacillus thuringiensis (Berliner). More variation in mortality among treatments was observed in third and fifth instars than in first instars. Pyrethroid, carbamate, and organophosphorous insecticides resulted in higher mortality than did B. thuringiensis. Diflubenzuron, an insect growth regulator, was as effective as commonly used insecticides against third and fifth instar larvae when mortality was observed at pupation. Third instar FAW placed on plant tissue from the upper section of cotton plants sprayed in field situations suffered higher mortality than those placed on plant tissue from lower sections in the plant canopy. Inadequate deposition of insecticide in the lower portions of the cotton plant appears to be a limiting factor in control of FAW larvae on cotton.

Download Full-text

PHEROMONE TRAPS FOR MONITORING FALL ARMYWORM, SPODOPTERA FRUGIPERDA (LEPIDOPTERA: NOCTUIDAE), POPULATIONS1

Journal of Entomological Science ◽

10.18474/0749-8004-24.1.34 ◽

1989 ◽

Vol 24 (1) ◽

pp. 34-39 ◽

Cited By ~ 8

Author(s):

S. D. Pair ◽

J. R. Raulston ◽

A. N. Sparks ◽

S. R. Sims ◽

R. K. Sprenkel ◽

...

Keyword(s):

Spodoptera Frugiperda ◽

Fall Armyworm ◽

Dade County ◽

Pheromone Traps ◽

Design Standard ◽

Synthetic Pheromone ◽

Lepidoptera Noctuidae ◽

Army Worm

Comparisons of traps for capturing fall army worm, Spodoptera frugiperda, baited with virgin females or synthetic pheromone were conducted at Dade County and Quincy, FL, Brownsville, TX, and Tifton, GA. Significantly higher numbers of fall armyworm males were captured in traps, irrespective of design, that were baited with a four - component lure, Terochem, than in identical traps baited with virgin females or a standard bait containing a 10 : 1 ratio of (Z) - 9 - dodecenol - 1 - ol acetate and (Z) - 9 - tetradecen - 1 - ol acetate. Wire - cone Hartstack traps baited with Terochem captured significantly more males than a plastic funnel - type Unitrap in two of three locations at Tifton, GA, during 1984 - 85, and at Quincy, FL, 1984. At Brownsville, TX, and Dade County, FL, the Unitrap baited with Terochem lures captured ca. as many or more fall armyworm males, respectively, than the Hartstack design. Standard green, yellow, and white Unitraps captured 2× more fall armyworm males than solid green Unitraps, suggesting that the color may influence rates of capture.

Download Full-text

Insect Populations on Bacillus thuringiensis Transgenic Sweet Corn

Journal of Entomological Science ◽

10.18474/0749-8004-37.4.285 ◽

2002 ◽

Vol 37 (4) ◽

pp. 285-292 ◽

Cited By ~ 12

Author(s):

Richard L. Hassell ◽

B. Merle Shepard

Keyword(s):

Bacillus Thuringiensis ◽

Plant Height ◽

Spodoptera Frugiperda ◽

Transgenic Line ◽

Sweet Corn ◽

Transgenic Crop ◽

Transgenic Corn ◽

Late Season ◽

65 H ◽

Insect Populations

Insect populations and damage in three plantings (early, mid-, and late-season) of Bacillus thuringiensis (Bt) transgenic sweet corn were compared to a non-transgenic isoline at Charleston, SC, during 2000. The transgenic corn was expressing the crylA(b) gene from B. thuringiensis var. kurstaki. No fall armyworms, Spodoptera frugiperda (J. E. Smith), were present in the early-planted crop, and numbers of corn earworms, Heliocoverpa zea (Boddie), were significantly reduced in the Bt-transgenic corn compared to the non-Bt isoline. The non-Bt isoline had 65% H. zea infested ears compared to only 10% ears from the Bt-transgenic line. Damage and numbers of H. zea and S. frugiperda also were significantly higher in the non-Bt sweet corn planted in mid- and late-season plantings. Percent damaged ears by H. zea was 77% in the non-transgenic sweet corn and 21% in the Bt-sweet corn during the mid-season crop. In the late-planted crop, populations of H. zea averaged 15 per 120 ears in the non-BT isoline compared to less than 2 per 120 ears in the Bt-transgenic crop. Whorl damage by fall armyworms significantly reduced plant height in both mid-season and late-season non-transgenic crops but not in Bt-transgenic sweet corn. Numbers of other insects and spiders were low and not significantly different between the two treatments. Bt transformed sweet corn will play a major role in reducing populations of H. zea, S. frugiperda and limiting pesticides in this crop.

Download Full-text