Agriculture and Natural Resources (ANRES)
Performance and population growth rate of cassava pink mealybug, Phenacoccus manihoti Matile-Ferrero (Hemiptera: Pseudococcidae) under different potassium fertilization regimes
Agriculture and Natural Resources -- formerly Kasetsart Journal (Natural Science), Volume 056, Issue 4, July 2022- August 2022, Pages 791-796
ISSN: 2452-316X(0075-5192)
DOI: doi.org/10.34044/j.anres.2022.56.4.13
Dang Hoa Tran
a,*
, Thi Giang Nguyen
a
, Trong Nghia Hoang
a
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a
Faculty of Agronomy, University of Agriculture and Forestry, Hue University, Hue 49116, Vietnam
*
Corresponding author, e-mail:
tdanghoa@hueuni.edu.vn
Abstract
Importance of the work: The application of potassium fertilizer to improve soil fertility can increase cassava yields and decrease crop damage due to pests. Objectives: To evaluate the influence of different potassium fertilizer rates on the cassava pink mealybug, Phenacoccus manihoti Matile-Ferrero. Materials & Method: The performance was investigated of P. manihoti feeding on potted cassava plants fertilized with three potassium fertilizer rates (0 kg K2O/ha, 90 kg K2O/ha and 180 kg K2O/ha). Results: P. manihoti fed on the cassava plants treated with different potassium fertilizer rates had longer developmental times, shorter longevity and lower fecundity than the mealybugs on the non-potassium fertilization treatment. The mealybugs that fed on the non-fertilized plants had higher adult body size and weight than the mealybug adults in the other treatments. The mealybugs feeding on potassium-treated plants had lower net reproduction, generation time and intrinsic rate of natural increase than those values for mealybugs in the non-potassium fertilization treatment. Main finding: An appropriate potassium fertilizer rate should be used to minimize the damage by P. manihoti to cassava.
Keywords
Cassava, Cassava pink mealybug, Life cycle, Phenacoccus manihoti, Potassium
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