Open AccessEffect of planting seasons and the associated weather conditions on the incidence of the rice gall midge pachydiplosis oryzae (Wood-Mason)
Author(s) -
B. J. Thomas,
C. A. Abraham,
K. R. Karunakaran,
R. Gopalakrishnan
Publication year - 1975
Publication title -
mausam
Language(s) - English
Resource type - Journals
ISSN - 0252-9416
DOI - 10.54302/mausam.v26i2.2172
Subject(s) - midge , infestation , pest analysis , gall , sowing , agronomy , maximum temperature , biology , shoot , relative humidity , growing season , horticulture , botany , geography , meteorology , physics , thermodynamics
Studies were carried out at the Rice Research Station, Pattambi (Kerala) to ascertain the extent of damage caused by the rice gall midge Pachydiplosis oryzae (Wood-Mason) to IR. 8-paddy crop planted at different fortnightly intervals during 1987-6g to 1971-72. The Influence of rainfall, relative humidity, minimum and maximum temperatures on infestation by the pest was also investigated. The pest incidence was found to be maximum and sharp decline for crops planted in June and first fortnight of July respectively, on the basis of the occurrence of silver shoots at 45 days after planting.
The percentage incidence of silver shoots caused by the pest is correlated positively with rainfall and negatively with maximum temperature. Partial correlation studies have revealed the Independent Influence of rainfall and maximum temperature on gall midge infestation.