Temperature Thresholds and Thermal Requirements for the Development of the Rice Leaf Folder, Cnaphalocrocis medinalis

The rice leaf folder, Cnaphalocrocis medinalis Guenée (Lepidoptera: Pyralidae) is a predominant foliage feeder in all the rice ecosystems. The objective of this study was to examine the development of leaf folder at 7 constant temperatures (18, 20, 25, 30, 32, 34, 35° C) and to estimate temperature...

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Bibliographic Details
Published in:Journal of Insect Science 2013, Vol.13 (96), p.1-14
Main Authors: Padmavathi, Chintalapati, Katti, Gururaj, Sailaja, V., Padmakumari, A.P., Jhansilakshmi, V., Prabhakar, M., Prasad, Y.G.
Format: Article
Language:English
Subjects:
Animals
biology
Cnaphalocrocis medinalis
degree days
developmental thresholds
ecosystems
eggs
Female
heat
heat sums
India
Insect Control
Larva - growth & development
leaf development
leaves
Lepidoptera
life table
Linear Models
Male
Models, Biological
Moths - growth & development
Nonlinear Dynamics
Oryza - growth & development
Oryza sativa
Ovum - growth & development
pest forecast models
Pupa - growth & development
pupae
Pyralidae
Regression analysis
rice
Temperature
Time Factors
Zoological research
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Summary:The rice leaf folder, Cnaphalocrocis medinalis Guenée (Lepidoptera: Pyralidae) is a predominant foliage feeder in all the rice ecosystems. The objective of this study was to examine the development of leaf folder at 7 constant temperatures (18, 20, 25, 30, 32, 34, 35° C) and to estimate temperature thresholds and thermal constants for the forecasting models based on heat accumulation units, which could be developed for use in forecasting. The developmental periods of different stages of rice leaf folder were reduced with increases in temperature from 18 to 34° C. The lower threshold temperatures of 11.0, 10.4, 12.8, and 11.1° C, and thermal constants of 69, 270, 106, and 455 degree days, were estimated by linear regression analysis for egg, larva, pupa, and total development, respectively. Based on the thermodynamic non-linear optimSSI model, intrinsic optimum temperatures for the development of egg, larva, and pupa were estimated at 28.9, 25.1 and 23.7° C, respectively. The upper and lower threshold temperatures were estimated as 36.4° C and 11.2° C for total development, indicating that the enzyme was half active and half inactive at these temperatures. These estimated thermal thresholds and degree days could be used to predict the leaf folder activity in the field for their effective management.
ISSN:1536-2442
1536-2442
DOI:10.1673/031.013.9601