A Population Dynamics Study of the Bollworm 1 and the Tobacco Budworm with Light Traps 23

1973 ◽  
Vol 2 (2) ◽  
pp. 244-252 ◽  
Author(s):  
A. W. Hartstack ◽  
J. P. Hollingsworth ◽  
R. L. Ridgway ◽  
J. R. Coppedge
Keyword(s):  
Population Dynamics ◽  
Tobacco Budworm ◽  
Light Traps

scholarly journals HELICOVERPA ARMIGERA-PEST ON TOBACCO PLANTS

2019 ◽  
pp. 539-545
Author(s):  
Vesna Krsteska
Keyword(s):  
Population Dynamics ◽  
Helicoverpa Armigera ◽  
Coccinella Septempunctata ◽  
Field Trials ◽  
Tobacco Budworm ◽  
Economic Losses ◽  
Tobacco Plants ◽  
Helicoverpa Armígera ◽  
Hyposoter Didymator ◽  
In The Beginning

Helicoverpa armigera Hubner is а migratory, cosmopolitan and polycyclic species. The pest is known as tobacco bollworm or budworm. The species is polyphagous and is an economically important agricultural pest. The studies were conducted on tobacco plants in the Experimental Field of the Scientific Tobacco Institute - Prilep during 2017/2018. Monitoring of population dynamics of H. armigera was performed during tobacco vegetation in a 10 -day period, using the method of examining 100 tobacco plants, with Zig-Zag review of pest scouting. The collected larvae were additionally fed and grown in a laboratory according to the standard laboratory methodology. Field and laboratory trials were carried out for control of H. armigera, with five insecticides/ active ingredients: Spinetoram (a.i. 250 g/kg)- 0.3 kg/ha, Indoxacarb (a.i. 150 g/L)- 0.3 L/ha, Metaflumizone (a.i 240 g/L)- 1 L/ha; Emamectin (a.i. 9.5 g/kg)- 2 kg/ha and Flubendiamide (a.i. 480g/L)- 250 g/ha. Larvae of tobacco budworm damage flowers, seed capsules and top tobacco leaves. The population dynamics of H. armigera showed that the species was present on tobacco from the beginning of July (when plants produce flowers) until the end of tobacco vegetation. The population was the most numerous in August and reached its highest level of density on 20th August in both years. In field trials, were determined five predatory species that fed with young larvae of H. armigеrа: Chrysopa formosa (Neuroptera, Chrysopidae), Chrysopa perla (Neuroptera, Chrysopidae), Chrysopa carnea (Neuroptera, Chrysopidae), Coccinella septempunctata (Coleoptera, Coccinellidae) and Adonia variegata (Coleoptera, Coccinellidae). In the beginning of October on tobacco plants we found parasitized larvae of H. armigera. In laboratory conditions parasitized larvae ate less and ceased developing at their 4th stage- L4. In each parasitized larva was developed one parasite species of Hyposoter didymator (Hymenoptera, Ichneumonidae). H. didymator is endoparasitoid wasp, and it lives on host tissues. According to field and laboratory trials during 2017/2018, all applied insecticides showed high efficacy in H. armigera control. The highest average mortality of 100% was caused by insecticides: Spinetoram, Indoxacarb and Emamectin. Flubendiamide had 97.5% efficiency in control of this pest, and the insecticide Metaflumizone 95.0%. This pest represents a significant challenge to tobacco filed and it produces high economic losses of tobacco seed each year. For the control of H. armigera, it is required constant monitoring of the lifecycle of the pest. One part of management strategy is to study parasitoids, predators and microorganisms and use them against H. armigera. Chemical control is still the most reliable and economic way of protecting tobacco crop from tobacco bollworm.

Rice Water Weevil (Coleoptera: Curculionidae) Population Dynamics in Louisiana

2004 ◽  
Vol 39 (4) ◽  
pp. 623-642 ◽  
Author(s):  
Hanwu Shang ◽  
Michael J. Stout ◽  
Zhitao Zhang ◽  
Jiaan Cheng
Keyword(s):  
Population Dynamics ◽  
Growing Season ◽  
Research Station ◽  
Light Traps ◽  
Lissorhoptrus Oryzophilus ◽  
Ratoon Crop ◽  
Rice Water Weevil ◽  
Louisiana State University ◽  
Flight Muscles ◽  
Rice Water

The rice water weevil, Lissorhoptrus oryzophilus Kuschel, has long been an important pest of rice in the U.S. and has recently emerged as a pest of rice in Asia. A systematic study of the life history and population dynamics of this insect was conducted during the 2002 growing season at the Louisiana State University Rice Research Station, Crowley, Acadia Parish, LA, an area where it is a particularly severe pest. By monitoring weevil populations using collections from overwintering sites, from plots of rice planted throughout the growing season, and from light traps, and by dissecting collected weevils to assess the conditions of their fat bodies, flight muscles and ovaries, we concluded that a portion of the weevil population in Louisiana is univoltine, another portion is bivoltine, and another portion may pass through multiple generations if young rice is continually available. However, only one generation of weevils developed in a single rice field. Adult weevils invaded rice fields in apparently large numbers prior to flooding. Weevils possessing both well-developed ovaries and well-developed flight muscles were found in both light traps and rice plots, suggesting that adults were capable of seeking new habitats by flying if rice plants were not suitable for oviposition. Weevils were able to complete a generation on ratoon-crop rice. The emergence of overwintered weevils started in late March, with peak emergence occurring during April and May. Return to overwintering sites began in early June and continued until October. Weevils appeared to move among overwintering habitats. A comparison of weevil population dynamics in rice plots planted on different dates supported the use of early planting as a management strategy.

Population dynamics of the sugarcane borer, Eldana saccharina Walker (Lepidoptera: Pyralidae), in Natal, South Africa

1989 ◽  
Vol 79 (1) ◽  
pp. 61-80 ◽  
Author(s):  
P. R. Atkinson ◽  
A. J. M. Carnegie
Keyword(s):  
South Africa ◽  
Population Dynamics ◽  
Predictive Model ◽  
Population Change ◽  
Lower Mortality ◽  
Eldana Saccharina ◽  
Natural Mortality ◽  
Light Traps ◽  
Climatic Indices ◽  
Lepidoptera Pyralidae

AbstractInfestations of the sugarcane pest Eldana saccharina Walker have been consistently serious in one part of the cane-growing belt of Natal, South Africa. Mortality in this region over seven years was estimated from moth catches in light traps, checked against population change measured from extensive larval counts, and plotted against climatic indices. The object was to construct a predictive model to illustrate mortality in other regions of the cane belt, to which infestations have spread in recent years. The spread southwards along the coast did not seem to have resulted from a decrease in natural mortality, but the spread to higher altitudes appeared to be due to lower mortality associated with warmer and drier years. The phenology of the insect and the effect of the annual harvesting cycle on phenology are discussed.

Investigating Population Dynamics and Sex Structure of Exolontha castanea Chang (Coleoptera: Melolonthidae) Using Light Traps in Sugarcane Fields in China

Sugar Tech ◽  
2022 ◽  
Author(s):  
Xian-kun Shang ◽  
Ji-li Wei ◽  
Wei Liu ◽  
Xue-hong Pan ◽  
Cheng-hua Huang ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Light Traps ◽  
Sex Structure

scholarly journals Monitoring and detection of the swede midge (Diptera: Cecidomyiidae)

2007 ◽  
Vol 139 (5) ◽  
pp. 700-712 ◽  
Author(s):  
Rebecca H. Hallett ◽  
Sheila A. Goodfellow ◽  
James D. Heal
Keyword(s):  
Population Dynamics ◽  
Pheromone Trap ◽  
Pheromone Traps ◽  
Light Traps ◽  
Sticky Traps ◽  
Incandescent Light ◽  
Emergence Traps ◽  
Swede Midge ◽  
Contarinia Nasturtii

AbstractIn 2002, two types of light traps were compared against sticky yellow cards for efficiency and selectivity in capturing adult swede midge Contarinia nasturtii (Kieffer) (Diptera: Cecidomyiidae). Incandescent light traps were more efficient at capturing swede midge than were sticky traps. Incandescent light traps were more selective than blacklight traps and required less time for processing of samples and identification of captured midges. Emergence (2003 and 2004) and pheromone (2004) traps were used to assess swede midge population dynamics. Captures from emergence traps indicate up to five overlapping emergence events for swede midge each year. Emergence traps captured swede midge earlier in the season than pheromone traps, but pheromone-trap captures continued later in the season than those in emergence traps. Pheromone traps are small and portable, easy to maintain, and capture significantly more swede midge than emergence traps.

scholarly journals Surveillance entomologique des Culicoides (Diptera: Ceratopogonidae), vecteurs de la fièvre catarrhale en Tunisie

2009 ◽  
Vol 62 (2-4) ◽  
pp. 137 ◽  
Author(s):  
Soufien Sghaier ◽  
Salah Hammami ◽  
H. Hammami ◽  
A. Dkhil ◽  
Jean Claude Delecolle
Keyword(s):  
Population Dynamics ◽  
Light Traps ◽  
Entomological Surveillance ◽  
Biting Midges ◽  
Study Population ◽  
First Time ◽  
Arboviral Disease

Bluetongue (BT) is an arboviral disease that affects ruminants. BT virus is transmitted by biting midges of the genus Culicoides (Diptera: Ceratopogonidae). Since 1999, BTV outbreaks have occurred in Tunisia and two serotypes (BTV-2 and BTV-1) have been involved in 2000 and 2006, respectively. Entomological surveillance has been implemented in Tunisia with the aim to study population dynamics of C. imicola and other potential vectors. Two-night catches of midges per site were performed monthly from June 2006 through July 2008 on 14 sites through­out the country. A total of 11,582 Culicoides specimens, col­lected from 336 light traps, comprised 25 species of which seven were identified for the first time in Tunisia. The seasonal occur­rence of these species is described.

Evolutionary Games and Population Dynamics

1998 ◽  
Author(s):  
Josef Hofbauer ◽  
Karl Sigmund
Keyword(s):  
Population Dynamics ◽  
Evolutionary Games
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