Sequential sampling of Aphis gossypii Glover (Hemiptera: Aphididae) and Frankliniella schultzei Trybom (Thysanoptera: Thripidae) on cotton crop

Fernandes, Marcos Gino; Spessoto, RR; Degrande, Paulo Eduardo; Rodrigues, TR

doi:10.1590/s1519-566x2011000200016

Cited by 13 publications

(8 citation statements)

References 5 publications

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“…These results show the efficiency of sequential sampling with respect to the speed of decision making. Fernandes et al (2011) related the efficiency of this method to classify the density of the pest, compared to traditional methods, resulting in savings of time and effort for making decision regarding control or not. With the two graphical representations of the operation characteristic curve OC(p) it is verified that with an average of one adult per plant, the test indicates only 1% likelihood of recommending biological control without necessity, i.e., type I error.…”

Section: Resultsmentioning

confidence: 99%

Sequential sampling of Bemisia tuberculata (Bondar, 1923) (Hemiptera: Aleyrodidae) on cassava crop

Silva¹,

Mota²,

Fernandes³

et al. 2014

An. Acad. Bras. Ciênc.

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Estimate efficiently of the whitefly population (Bemisia tuberculata Bondar) in cassava, to assist in decision making of pest control is one of the advantages of sequential sampling plans. Therefore, the objective of this study was to determine a sequential sampling plan according to two methods of pest management, using biological and/or chemical control. Samples were obtained in a commercial field of 2.500,00 m 2 , divided into 100 plots. The visualization method was used for sampling of the upper leaves by counting the number of adults. In total 15 samples were taken weekly from January to April 2012. The spatial distribution model which best fit to the behavior of B. tuberculata adults was the negative binomial distribution. Levels adapted for biological and chemical control were five and twenty adults per plant, respectively. Sampling plans resulted in two decisions for each proposed method. Thus, for population control the upper limit was defined as S 1 = 4.2056 + 2.1540n (biological) and S 1 = 20.219 + 10.4306n (chemical); and the lower limit where the pest control is not recommended was defined by S 0 = -4.2056 + 2.1540n (biological) and S 0 = -20.219 + 10.4306n (chemical). Sequential sampling estimated the maximum number of sample units necessary for decision-making of three samples with 1.34 adults for biological control and 3.85 sample units with 7.39 adult pests for chemical control.

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Section: Resultsmentioning

confidence: 99%

Sequential sampling of Bemisia tuberculata (Bondar, 1923) (Hemiptera: Aleyrodidae) on cassava crop

Silva¹,

Mota²,

Fernandes³

et al. 2014

An. Acad. Bras. Ciênc.

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“…Due to injuries caused by feeding and transmitting phytoviruses, this insect causes great economic losses to crops such as tomatoes, cotton, soybeans and grapes (GALLO et al, 2002;ARAGÃO, 2009;FERNANDES et al, 2011;MOREIRA et al, 2012). F. schultzei transmits Tospovirus, Groundnut ring spot virus (GRSV) and Tomato spotted wilt virus (TSWV) to tomatos and is a more efficient GRSV vector than F. occidentalis (Pergande).…”

Section: Introductionmentioning

confidence: 99%

Insecticidal activity of citronella grass essential oil on Frankliniella schultzei and Myzus persicae

et al. 2013

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The thrips, Frankliniella schultzei, and green peach aphid, Myzus persicae, cause direct damage to plants of economic importance and transmit phytoviruses, causing large economic losses. Chemical constituents of essential oils present a wide range of biological activities. The aim of this work was to evaluate insecticidal activity of essential oil from citronella grass, Cymbopogon winterianus, on F. schultzei and M. persicae. This essential oil was obtained by steam distillation and components were identified by GC/FID and GC/MS. A Potter spray tower was used to spray insects with the essential oil. The major constituents are geraniol (28.62%), citronellal (23.62%) and citronellol (17.10%). Essential oil of C. winterianus at 1% (w v -1 ) causes mortality in F. schultzei and M. persicae at 34.3% and 96.9%, respectively. The LC 50 value for M. persicae was 0.36% and LC 90 0.66%. Thus, citronella grass essential oil at 1% (w v -1 ) is more toxic to M. persicae than F. schultzei. This essential oil shows promise for developing pesticides to manage M. persicae. Index terms:Cymbopogon winterianus, thrips, green peach aphid, volatile components, natural insecticide. RESUMOO tripes, Frankliniella schultzei, e o pulgão-verde, Myzus persicae, além de causarem danos diretos a plantas de importância econômica, também são importantes transmissores de fitoviroses, acarretando grandes perdas econômicas. Os constituintes químicos dos óleos essenciais têm sido cada vez mais estudados, pois apresentam uma ampla gama de atividades biológicas. Neste trabalho, objetivou-se avaliar a atividade inseticida do óleo essencial de capim-citronela, Cymbopogon winterianus, sobre F. schultzei e M. persicae. O óleo essencial foi obtido por hidrodestilação e a identificação dos seus componentes foi realizada por CG/DIC e CG/EM. Uma torre de Potter foi utilizada para pulverizar os insetos com óleo essencial. Os componentes majoritários encontrados são geraniol (28,62%), citronelal (23,62%) e citronelol (17,10% ) é mais tóxico para M. persicae do que para F. schultzei. Este óleo essencial mostra-se promissor para o desenvolvimento de inseticidas para o manejo de M. persicae. Termos para indexação:Cymbopogon winterianus, tripes, pulgão-verde, componentes voláteis, inseticida natural.

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“…Kerns et al () determined economic thresholds for A. gossypii on cotton based on the number of aphids per leaf. Fernandes, Spessoto, Degrande, and Rodrigues () developed a sequential sampling plan for A. gossypii on cotton based on the number of aphid colonies. However, this sampling plan was determined for only one cotton cultivar without considering the different phenological stages of the cotton plant.…”

Section: Introductionmentioning

confidence: 99%

Standardized sampling plan for Aphis gossypii based on the cotton cultivar, plant phenology and crop size

Araújo

Araujo

Silva

et al. 2019

J Applied Entomology

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A standardized sampling plan is the starting point for developing a decision‐making system for pest control. Aphis gossypii (Hemiptera: Aphididae) is a destructive sap‐feeding pest on cotton worldwide. However, research addressing cotton cultivar, plant phenology and field size with the aim of developing a sampling plan for A. gossypii has not been done. Therefore, in this study, we developed a standardized sampling for A. gossypii as a function of these factors. To accomplish this, A. gossypii densities in four experimental cotton cultivars were sampled weekly during year one to determine the ideal aphid characteristic to sample (by individual or colony). During year one and two, A. gossypii densities were sampled weekly in the same cultivars to determine sampling unit, sampling technique and the number of samples for an A. gossypii sampling plan. Using the sample number determined, the sampling time was recorded for cotton field size of 1, 5, 10, 50, 100 and 150 ha in order to estimate the sampling cost. In cotton, the count of individuals was the best characteristic for the assessment of A. gossypii. Leaves of the most apical branches for the vegetative and reproductive cotton plant stage were the best sampling units. The best sampling technique was direct counting. The cotton cultivar did not affect the development of the sampling plan. The A. gossypii sampling plan involved the evaluation of 58 samples per zone and required 20 min (<0.35 min/sample) for the evaluation of these samples. However, the walking time between samples was the main factor responsible for the total sampling time and cost in cotton fields, and this factor strongly depends on the size of the cotton field.

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Sequential sampling of Aphis gossypii Glover (Hemiptera: Aphididae) and Frankliniella schultzei Trybom (Thysanoptera: Thripidae) on cotton crop

Cited by 13 publications

References 5 publications

Sequential sampling of Bemisia tuberculata (Bondar, 1923) (Hemiptera: Aleyrodidae) on cassava crop

Sequential sampling of Bemisia tuberculata (Bondar, 1923) (Hemiptera: Aleyrodidae) on cassava crop

Insecticidal activity of citronella grass essential oil on Frankliniella schultzei and Myzus persicae

Standardized sampling plan for Aphis gossypii based on the cotton cultivar, plant phenology and crop size

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