Butler, D.R. and Wadia, K.D.R. and Reddy, R.K. (1995) Effects of humidity, leaf wetness, temperature and light on conidial production by Phaeoisariopsis personata on groundnut. Plant Pathology, 44 (2). pp. 662-674.
![[img]](http://eprints.icrisat.ac.in/style/images/fileicons/application_pdf.png) |
PDF
Restricted to ICRISAT researchers only |
Abstract
Controlled-environment studies of conidial production by Phaeoisariopsis personata on groundnut are described. With constant relative humidity (RH), conidia were only produced above a threshold (94 5% RH) and there was a linear increase between 94 5% RH and 100% RH, Conidial production was less with continuous leaf wetness (resembling heavy dew) than with continuous 98-99% RH, but it was similar with intermittent leaf wetness and intermittent 98-99% RH (8 h at 70% RH each day). With alternate high O 9 7% RH) and low humidity, daily conidial production depended both on the duration of high RH and on the low RH value. With 99% RH at night (12 h), night-time conidial production decreased with the previous daytime RH, After conidial production had started, small numbers of conidia were produced even when the RH was well below the threshold (94-5%). Conidia were produced in continuous light when the photon flux density was 2 /imol/m^/s, but production was completely inhibited with 60 ^mol/m^/s. With constant RH, more conidia were produced with a 12 h photoperiod than in continuous darkness. However, more than 75% of the conidia were produced in the dark. With continuous darkness, more conidia were produced during the night (18.00-06.00 h) than during the day, but this biological rhythm was overcome with a (light-night)/(dark-day) regime. With constant 98-99% RH there was a linear increase in conidial production with temperature between 10 and 28°C, and virtually no conidia were produced at 33°C, The daily production of conidia increased with time for 2 to 6 days, depending on the treatment.
| Item Type: | Article |
|---|---|
| Author Affiliation: | International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru 502 324, Andhra Pradesh, India |
| Subjects: | Atmosperic Science Plant Production |
| Divisions: | Groundnut |
| Depositing User: | Sandhya Gir |
| Date Deposited: | 12 Jan 2011 16:49 |
| Last Modified: | 12 Jan 2011 16:49 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/1357 |
Actions (login required)
 |
View Item |
