EFFECT OF TEMPERATURE AND CASSAVA GENOTYPE ON THE DEVELOPMENT, FECUNDITY AND REPRODUCTION OF Bemisia tabaci SSA1
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Date
2022
Journal Title
Journal ISSN
Volume Title
Publisher
African Crop Science Journal, Vol. 30, No. 2, pp. 185 - 203
Abstract
The Bemisia tabaci complex is currently recognised as key agricultural pests that cause economic
damage globally. Temperature is the most important driver of changes in behaviour, abundance and
distribution of insect pests, including the whitefly (Bemisia tabaci). The objective of this study was
to evaluate the development, fecundity and reproduction of B. tabaci SSA1 on cassava genotypes
under a range of temperatures. A laboratory study was conducted using three cassava genotypes
(Alado alado, NAROCASS 1 and NASE 14) at five constant temperatures (16, 20, 24, 28 and 32 °C). The
parameters assessed included development duration, survival, fecundity and population parameters
for B. tabaci SSA1. Temperature had significant effects (P<0.001) on development time, survival and
fecundity of B. tabaci; while cassava genotype had no effect (P>0.05). An inverse relationship was
observed between development time and temperature for all stages across all cassava genotypes. The
total life cycle was 63.8 days at 16 °C and 17.9 days at 32 °C on NAROCASS 1. Survival for each stage
throughout the entire life cycle increased with temperature and was highest at 32 °C, although this was
not significantly different from that at 28 °C. Fecundity increased with temperature and was highest at
32 °C on all cassava genotypes. For all cassava genotypes, the intrinsic rate of increase (rm
), finite rate
of increase (λ) and net reproductive rate (Ro
) increased with temperature, while mean generation time
(T) reduced following a similar pattern. At 32 °C, rm
, Ro
, λ and T were 0.2, 48.7, 1.2 and 22.6 days,
respectively; compared to 0.01, 1.9, 1.0 and 71.2 days at 16 °C on Alado alado. Therefore, the ideal
development temperature for B. tabaci SSA1 is 32 °C. Thus, there is a risk of accelerated future
expansion of B. tabaci SSA1 populations globally, with global warming and climate variability.
Description
Keywords
Climate Change, net reproductive rate
Citation
Katono, K., Macfadyen, S., Omongo, C. A., Colvin, J., Karungi, J., & Otim, M. H. (2022). Effect of temperature and cassava genotype on the development, fecundity and reproduction of Bemisia tabaci SSA1. African Crop Science J:10.4314/acsj.v30i2.6ournal, 30(2), 185-203.