Estimating Field Populations of Tobacco Budworm Moths
1
from Pheromone Trap Catches
23

Hartstack, A. W.; Witz, J. A.

doi:10.1093/ee/10.6.908

Cited by 34 publications

(24 citation statements)

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“…During that time it was believed that a single annual infestation source for the dissemination of this pest existed and under this scenario explained the lack of genetic diversity found in those studies. With the development of more accurate techniques the TBW migration distance was greatly reduced to ~8 km, 62,96,98 close to what was calculated with MRR techniques. 96 Some of these and other studies have suggested that there are two behavioral types of tobacco budworms; those that migrate in few numbers while the majority of them diapause and survive local conditions, giving rise to local populations.…”

Section: Can the Movement Of Tobacco Budworm Helpsupporting

confidence: 53%

“…Data generated with pheromone traps are not always a precise indicator of larval densities in the field. [61][62][63][64][65] However, with data presented as average annual numbers of males per trap per day from pheromone-trap captures, a trend over 25 years indicates that males are not currently as abundant now as they were when the monitoring technique was first launched (Fig. 3).…”

Section: A Hard-to-kill Pestmentioning

confidence: 99%

“…Some of the greatest distances recorded by mark-release-recapture (MRR) techniques are up to 112 km, 95 but other studies have measured this distance to be only 0.3-8 km. 62,96 Genetic analysis techniques first proposed no variation among populations in an area as wide as 2,220 km, 97 concluding that there was a southern metapopulation. During that time it was believed that a single annual infestation source for the dissemination of this pest existed and under this scenario explained the lack of genetic diversity found in those studies.…”

Section: Can the Movement Of Tobacco Budworm Helpmentioning

confidence: 99%

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Heliothis virescens and Bt cotton in the United States

Blanco

2012

GM Crops & Food

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Section: Can the Movement Of Tobacco Budworm Helpsupporting

confidence: 53%

Section: A Hard-to-kill Pestmentioning

confidence: 99%

Section: Can the Movement Of Tobacco Budworm Helpmentioning

confidence: 99%

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Heliothis virescens and Bt cotton in the United States

Blanco

2012

GM Crops & Food

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“…The density of an insect population, however, is a parameter that cannot easily be obtained by direct field observations because traps usually sample only a small proportion of all individuals. To overcome this problem, it is often the case that captures of insects in traps are compared to simulated data [14]. An advection-diffusion equation is considered for modelling the dynamics of fruit flies, where density is the initial value of the model.…”

Section: Introductionmentioning

confidence: 99%

Parameter Identification in Population Models for Insects Using Trap Data

Dufourd¹,

Weldon²,

Anguelov³

et al. 2013

BIOMATH

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BIOMATH h t t p : / / w w w. b i o m a t h f o r u m . o r g / b i o m a t h / i n d e x . p h p / b i o m a t h /Abstract-Traps are used commonly to establish the presence and population density of pest insects. Deriving estimates of population density from trap data typically requires knowledge of the properties of the trap (e.g. active area, strength of attraction) as well as some properties of the population (e.g. diffusion rate). These parameters are seldom exactly known, and also tend to vary in time, (e.g. as a result of changing weather conditions, insect physiological condition). We propose using a set of traps in such a configuration that they trap insects at different rates. The properties of the traps and the characteristics of the population, including its density, are simultaneously estimated from the insects captured in these traps. The basic model is an advection-diffusion equation where the traps are represented via a suitable advection term defined by the active area of the traps. The values of the unknown parameters of the model are derived by solving an optimization problem. Numerical simulations demonstrate the accuracy and the robustness of this method of parameter identification.

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“…Isso porque o número de insetos capturados depende de muitos fatores, incluindo o formato e a posição da armadilha, a mistura do feromônio e a taxa de liberação, a aplicação de inseticidas, as práticas culturais, os ciclos de geração do inseto e as condições climáticas (Adams et al 1995). Hartstack & Witz (1981) apontam outro fator que afeta a captura na armadilha de feromônio, que é a competição entre a armadilha e as fêmeas na atração dos machos.…”

Section: Resultsunclassified

Comparação de Procedimentos de Amostragem de Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae) em Tomateiro Estaqueado

Gomide¹,

Vilela²,

Picanço³

2001

Neotrop. Entomol.

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-In order to obtain a more reliable sampling method of the South American Tomato Moth, Tuta absoluta (Meyrick) (= Scrobipalpuloides absoluta), we compared different methodologies in an 1 ha commercial tomato crop. We sampled the last three expanded leaves, three expanded leaves at the medium canopy, the entire plant leaves and the catches by a pheromone trap, at 100 and 130 days after planting the seedlings. A randomized complete block with four replications was used, with each plot measuring 30 x 30 m. The number of eggs, leaf mines and larvae were counted on each leaf, as well as the number of adults captured in the pheromone trap. Counts in the entire plant leaves were taken as the control. The medium canopy method provided a better association for mines (R 2 = 0.87) and larvae (R 2 = 0.88), while egg counts were better associated with the three last expanded leaves (r 2 = 0.68). The number of eggs provided a better association with the number of larvae and mines (R 2 = 0.67 and R 2 = 0.85 respectively). Therefore, it is possible to predict damage by T. absoluta based on egg counting. Pheromone traps revealed an increase in adults number from 100 to 130 days of the crop. The increase in adult population has followed mine and larvae numbers.KEY WORDS: Insecta, pheromone trap, sampling method.RESUMO -O objetivo deste trabalho foi obter um método acurado para amostrar a traça do tomateiro, Tuta absoluta (Meyrick) (= Scrobipalpuloides absoluta). Conduziu-se um experimento em lavoura comercial de tomate estaqueado de 1 ha, em Coimbra, MG, para comparação de quatro métodos de amostragem (três folhas expandidas do terço apical, três folhas expandidas do terço médio, armadilhas de feromônio e folhas da planta inteira) nas idades de 100 e 130 dias após o transplantio das mudas. O delineamento utilizado foi o de blocos casualizados com quatro repetições, medindo, cada parcela, 30 x 30 m. A amostragem nas parcelas foi feita seguindo um caminhamento em zigue-zague. Nas folhas, em laboratório, contou-se o número de ovos, minas e lagartas e, nas armadilhas, o número de adultos capturados. As contagens nas plantas inteiras foram consideradas, para todos os métodos, como padrão para comparação. O método do terço mediano foi o que mostrou maiores valores de coeficientes de determinação, tanto para a contagem de minas (R 2 = 0,87), quanto para a de lagartas (R 2 = 0,88), sendo o método de amostragem do terço superior o que apresentou melhor resultado para a contagem de ovos (r 2 = 0,68). O número de ovos apresentou relação satisfatória com o de minas e lagartas (R 2 = 0,67 e R 2 = 0,85, respectivamente), mostrando que se pode inferir sobre as injúrias na planta com base no número de ovos. As armadilhas de feromônio revelaram um aumento no número de adultos da idade de 100 para 130 dias. Este aumento da infestação, inferido pela captura na armadilha, também pode ser observado nas plantas por meio do aumento no número de minas e lagartas.PALAVRAS-CHAVE: Insecta, armadilha de feromônio, método de amostragem.

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Estimating Field Populations of Tobacco Budworm Moths 1 from Pheromone Trap Catches 23

Cited by 34 publications

References 0 publications

Heliothis virescens and Bt cotton in the United States

Heliothis virescens and Bt cotton in the United States

Parameter Identification in Population Models for Insects Using Trap Data

Comparação de Procedimentos de Amostragem de Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae) em Tomateiro Estaqueado

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