The Effect of Freezing Temperatures on Microdochium majus and M. nivale Seedling Blight of Winter Wheat

Table 1

Effect of timing (a) and duration (b) of freezing on rate of seedling emergence (seedlings day⁻¹) from a winter wheat cv. Equinox seed lot naturally infected (88%) with Microdochium spp. and a non-infected seed lot, and the timing of freezing*duration of freezing interaction (c) on rate of seedling emergence (seedlings day⁻¹) from a non-infected winter wheat cv. Equinox seed lot.

(a)

Timing of freezing	Infected seedlot	Non-infected seedlot
None	0.055	0.253
Pre-emergent	0.046	0.221
Post-emergent	0.058	0.267
LSD (𝑃<0.05)	0.0267	0.0246
SEM	0.0120	0.0111
DF	79	80
CV (%)	16.6	7.1

Data are back transformed, statistical analysis performed on square root transformed data.

(b)

Duration of freezing	Infected seedlot	Non-infected seedlot
None	0.055	0.253
12 hours	0.056	0.258
24 hours	0.048	0.229
LSD (𝑃<0.05)	0.0267	0.0246
SEM	0.0120	0.0111
DF	79	80
CV (%)	16.6	7.1

Data are back transformed, statistical analysis performed on square root transformed data.

(c)

	Duration of freezing
Timing of freezing	12 hours	24 hours	LSD	SED	DF	CV (%)
Pre-emergent	0.250	0.193	0.0269	0.0111	80	7.1
Post-emergent	0.267	0.267

Rate of emergence of non-frozen seedlings 0.253 seedlings day⁻¹.
Data are back transformed, statistical analysis performed on square root transformed data.