Title:	Standardized sampling plan for Aphis gossypii based on the cotton cultivar, plant phenology and crop size.
Authors:	ARAÚJO, T. A. ARAUJO, L. H. A. SILVA, N. R. LUZ, C. E. A. SILVA, E. M. da MOREIRA, M. D. SUINAGA, F. A. PICANÇO, M. C. BASTOS, C. S.
Affiliation:	Tamíris A. Araújo, Universidade Federal de Viçosa - UFV/Departamento de Entomologia; LUCIA HELENA AVELINO ARAUJO, CNPA; Nilson R. Silva, Universidade Federal de Sergipe - UFSE/Núcleo de Graduação em Agronomia; Carlos Eduardo A. Luz, Universidade de Brasília - UnB/ Instituto Central de Ciências Ala Sul/Faculdade de Agronomia e Medicina Veterinária; Ézio M. da Silva, Universidade Federal de Viçosa - UFV/Instituto de Ciências Agrárias; Márcio D. Moreira, Universidade Federal de Viçosa - UFV/Departamento de Entomologia; FABIO AKIYOSHI SUINAGA, CNPH; Marcelo C. Picanço, Universidade Federal de Viçosa - UFV/Departamento de Entomologia; Cristina S. Bastos, Universidade de Brasília - UnB/Instituto Central de Ciências/Faculdade de Agronomia e Medicina Veterinária Universidade de Brasília.
Date Issued:	2019
Citation:	Journal of Applied Entomology, v. 143, n. 8, p. 893-901, 2019.
Description:	A standardized sampling plan is the starting point for developing a decision&#8208;making system for pest control. Aphis gossypii (Hemiptera: Aphididae) is a destructive sapfeeding 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.
Thesagro:	Gossypium Hirsutum
NAL Thesaurus:	Integrated pest management
Keywords:	Cotton aphid Sampling technique Sampling unit
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CNPA)