scholarly journals Selección recurrente recíproca en maíz: tolerancia al ataque del gusano de la mazorca y el cogollero (Lepidoptera: Noctuidae).

2016 ◽  
Vol 9 (1) ◽  
pp. 42
Author(s):  
Mario Fuentes ◽  
Alberto Pantoja ◽  
Antonio Sotomayor ◽  
James Beaver
Keyword(s):  
Spodoptera Frugiperda ◽  
Helicoverpa Zea ◽  
Research Station ◽  
Selection Cycle ◽  
Agronomic Characteristics ◽  
Maize Populations ◽  
Natural Infestation ◽  
Lepidoptera Noctuidae ◽  
Initial Selection ◽  
Selection Of

The progressive selection of yield, agronomic characteristics and quantification of damages caused by Spodoptera frugiperda (J.E. Smith) and Helicoverpa zea (Boddie), were evaluated after four selection cycles on maize populations (Zea mays L., varieties Ohio S9, Ohio S10, Mayorbela and Diente de caballo, under chemical control and natural infestation conditions. The experiments were carried out at an experimental site in a tropical agriculture research station (TARS), a USDA station located in Isabela, Puerto Rico. The experimental design consisted of random entire blocks with five repetitions, and treatments were asigned according to a factorial arrangement with parcels divided at a density of 44.444 plants/ha. Significant differences were found among populations and selection cycles for yield, plant and cob height, and percentage of insect-related losses*. The highest yield was obtained from the Ohio S 10 population with 4.824 kg/ha, and 169 kg/ha - a profit of 1.2% per selection cycle. The latest selection cycles showed a greater yield and better agronomic characteristics than the initial selection cycle of each population under improvement. Losses in yield caused by S. frugiperda and H. zea oscillated between 3-21 % and 17-28%, respectively. Ohio S9 showed the greatest los s in yield caused by these insects.

scholarly journals POTENTIATION OF COPAÍBA OIL-RESIN WITH SYNTHETIC INSECTICIDES TO CONTROL OF FALL ARMYWORM

2017 ◽  
Vol 30 (4) ◽  
pp. 1059-1066
Author(s):  
WALDIANE ARAÚJO DE ALMEIDA ◽  
IGOR HONORATO LEDUÍNO DA SILVA ◽  
ANA CLÁUDIA VIEIRA DOS SANTOS ◽  
AURÉLIO PAES BARROS JÚNIOR ◽  
ADALBERTO HIPÓLITO DE SOUSA
Keyword(s):  
Human Health ◽  
Spodoptera Frugiperda ◽  
Filter Paper ◽  
Fall Armyworm ◽  
Botanical Insecticides ◽  
Response Curves ◽  
Significant Toxicity ◽  
Copaiba Oil ◽  
Lepidoptera Noctuidae ◽  
Selection Of

ABSTRACT The control of Spodoptera frugiperda (J. E. SMITH) (Lepidoptera: Noctuidae) has been carried out mainly with pyrethroids and organophosphates insecticides. The continuous and indiscriminate use of synthetic insecticides, for decades, has led to the selection of resistant populations and has caused concerns for human health and the environment. An alternative is the use of botanical insecticides, including through the mixtures with synthetic insecticides. This study aimed to investigate the toxicity of copaiba oil-resin mixtures (COR) with deltamethrin, beta-cyfluthrin, beta-cypermethrin, methomyl, triazophos and chlorpyrifos for S. frugiperda. Bioassays were performed in the laboratory using newly hatched caterpillars on a contaminated surface (filter paper). Initially, concentration-mortality curves were established for each insecticide and COR. Based on the results, experiments were conducted to verify the effect of the COR mixtures with synthetic insecticides in the proportions of 1:1 (LC25 + LC25) on larvae of S. frugiperda. Additionally, COR concentration-response curves were established by adding 1/8 of the recommended rate of each insecticide. Notably, the use of this concentration for all insecticides was previously determined in bioassays, and no significant toxicity was found for S. frugiperda caterpillars. It was found that the toxicity of COR increased substantially by adding synthetic insecticides, especially with lower mixtures with beta-cypermethrin, methomyl and triazophos.

Bionomics of the Fall Armyworm (Lepidoptera: Noctuidae) and Its Ectoparasitic Nematode, Noctuidonema guyanense, in South Georgia

1996 ◽  
Vol 31 (2) ◽  
pp. 209-217
Author(s):  
C. E. Rogers ◽  
O. G. Marti ◽  
L. D. Chandler ◽  
A. M. Simmons
Keyword(s):  
Spodoptera Frugiperda ◽  
Heliothis Virescens ◽  
Helicoverpa Zea ◽  
Fall Armyworm ◽  
Corn Earworm ◽  
Cotton Bollworm ◽  
Tobacco Budworm ◽  
Beet Armyworm ◽  
South Georgia ◽  
Lepidoptera Noctuidae

The fall armyworm, Spodoptera frugiperda (J. E. Smith), is a perennial immigrant pest of several crops in south Georgia. Moths of S. frugiperda commonly are infested by an ectoparasitic nematode, Noctuidonema guyanense Remillet and Silvain in the Southeast. The seasonal chronology and natural association of these species are reported for Tift Co. from 1988 to 1994. Seasonal influxes of non-infested moths usually arrive in late April and dissipate in early November. Seasonal influxes of infested male moths follow the initial immigrants by 4 to 6 wks and disappear in the fall from 1 to 2 mos earlier than the general moth populations. Feral male moths that are moderately worn and infested by N. guyanense weigh less than moderately worn, non-infested males. Noctuidonema guyanense infests moths of several species of noctuids, but it has not been found on the cotton bollworm/corn earworm [Helicoverpa zea (Boddie)], tobacco budworm [Heliothis virescens (Fab.)], or beet armyworm [S. exigua (Hubner)].

Survival of Archytas marmoratus (Diptera: Tachinidae) in Helicoverpa zea and Spodoptera frugiperda (Lepidoptera: Noctuidae) at Low Temperatures and Short Days

2000 ◽  
Vol 35 (1) ◽  
pp. 9-21 ◽  
Author(s):  
F. I. Proshold ◽  
J. E. Carpenter
Keyword(s):  
Spodoptera Frugiperda ◽  
Low Temperatures ◽  
Helicoverpa Zea ◽  
Fall Armyworm ◽  
Host Population ◽  
Corn Earworm ◽  
Diapause Induction ◽  
Threshold Temperature ◽  
Lepidoptera Noctuidae ◽  
Short Days

Archytas marmoratus (Townsend) was reared on corn earworm, Helicoverpa zea (Boddie), or fall armyworm, Spodoptera frugiperda (J. E. Smith). Rearing chambers were programmed for a constant temperature of 15, 16, 19, 20, 22, 24, or 25°C and a photoperiod of 10:14 h (L:D) or 25°C and a photoperiod of 12:12 h (L:D). Development of parasitoids was faster when corn earworm larvae were parasitized than when fall armyworm larvae were parasitized. At 15°C parasitoid survival was poor on both hosts but at 16°C, more parasitoids eclosed on corn earworm than fall armyworm. Diapause induction in this strain of corn earworm was low. All pupae that eclosed after being in diapause produced an adult corn earworm. The data suggested that A. marmoratus is not influenced by diapause induction in its host but continues to develop above the threshold temperature for survival. This would restrict its overwintering as a larva or pupa to regions that have a continuous, nondiapausing host population. Thus, yearly establishment of A. marmoratus in more temperate areas would be required.

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