Management and population fluctuation of cassava mealybug Phenacoccus manihoti Matile-Ferrero (Hemiptera: Pseudococcidae)

Authors

DOI:

https://doi.org/10.5433/1679-0359.2019v40n5p1829

Keywords:

Cultural management, Insect pest, Infestation, Manihot esculenta.

Abstract

Cassava is one of the main foods in Brazil, playing a key role in the diet of several communities. In the Central-Southern region of Brazil, several pests are associated with cassava, among which the cassava mealybug stands out due to its high potential for damage. The aim of the present study was to evaluate the population dynamics and the effect of pruning and different cassava management on the developmental stages of mealybug, Phenacoccus. manihoti. The experiment was conducted in Santa Monica, PR, with ‘Cauiá’ cultivar, involving a randomized complete block design with four replications and six treatments: 1) No pruning: intact plants, 2) Pruning soil: pruned close to the soil without plant material, 3) Pruning at 15 cm: conventional pruning at 15 cm of the soil with vegetative material, 4) Pruning + branches: conventional pruning, with the middle portion of the plant in the plot and removal of the apical region of the plant, 5) Pruning + apical: conventional pruning, with the removal of the middle portion of the plant and retaining the apical parts of the plant, and 6) Pruning - branches - apical: conventional pruning, with the removal of the middle and apical portions of the plant. After 7-days of pruning, the number of eggs, nymphs, and adults were counted, and the population variation was monitored at weekly interval for a month. For the insect count, four sites were randomly chosen in a zigzag manner within each plot and four plants were evaluated, totaling 16 plants per plot. Based on the counts, the percentage of plants with eggs, nymphs, and adults was calculated. The data of the variables were transformed by ?(x+5), subjected to analysis of variance and Scott Knot test (5%). The percentage of plants with egg mass and adults of P. manihoti was highest in plots that had no pruning. The pruning close to the soil combined with the removal of vegetative material resulted in plants with fewest eggs of P. manihoti. Removal of the apical region portion of the cassava plant reduced the number of P. manihoti nymphs and adults.

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Author Biographies

Diego Gazola, Universidade Estadual de Londrina

Dr. em Agronomia, Universidade Estadual de Londrina, UEL, Londrina, PR, Brasil.

Vanda Pietrowski, Universidade Estadual do Oeste do Paraná

Profa. Dra., Departamento de Ciências Agrárias, Universidade Estadual do Oeste do Paraná, UNIOESTE, Campus Marechal Cândido Rondon, PR, Brasil.

Claudemir Zucareli, Universidade Estadual de Londrina

Prof. Dr., Departamento de Ciências Agrárias, UEL, Londrina, PR, Brasil.

Diandro Ricardo Barilli, Universidade Estadual Paulista

Discente de Doutorado em Entomologia Agrícola, Universidade Estadual Paulista, UNESP, Jaboticabal, SP, Brasil.

Rudiney Ringenberg, Empresa Brasileira de Pesquisa Agropecuária

Dr. Pesquisador, Empresa Brasileira de Pesquisa Agropecuária, Embrapa Mandioca e Fruticultura, Centro Avançado Centro-Sul, Londrina, PR, Brasil.

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Published

2019-07-04

How to Cite

Gazola, D., Pietrowski, V., Zucareli, C., Barilli, D. R., & Ringenberg, R. (2019). Management and population fluctuation of cassava mealybug Phenacoccus manihoti Matile-Ferrero (Hemiptera: Pseudococcidae). Semina: Ciências Agrárias, 40(5), 1829–1836. https://doi.org/10.5433/1679-0359.2019v40n5p1829

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