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Prostrate knotweed (Polygonum aviculare L.) is a persistent native weed of China. This weed is characterized by high genetic and biological plasticity having a capacity to spread on a landscape scale. The present study planned to investigate the infection of a plant parasitic powdery mildew on P. aviculare on a landscape scale in three different locations of Shenyang during 2018. These locations were selected with a control treatment for proper comparison. Different growth parameters were observed and calculated by coefficient of determination (R2). Maximum temperature (Maxt) ranged 25-30 °C and Minimum temperature (Mint) between 17-20 °C with relative humidity 64-78% played a vital role for the emergence and flourishing of pathogen pressure on the plant. The elevated value of R2 = 0.97 for Mint with RMSE (Root Mean Square Error) < 5 recorded excellent prediction followed by R2 = 0.82 with RMSE < 5-10 for Maxt recorded very good model prediction. Highly significant (P < 0.001) height of Polygonum aviculare was recorded (23.125 ± 0.59) in parasite free plants compared to (20.99 ± 0.96) location-I having Mean ± SD. Both temperature ranges has a significant effect (P < 0.0001) with (F = 5.917; P < 0.0001; F = 25.721; P < 0.0001) three locations; however, the effect of the locations on plants height (P. aviculare) did not differ statistically (F = 2.102; P > 0.05) between two temperature ranges from 25-30 °C and 17-20 °C. According to our findings, plant parasitic powdery mildew (pathogen strain HMLAC226) affected significantly with growth characteristics of prostrate knotweed.

applied ecology and environmental research

PARASITIC ACTIVITY OF POWDERY MILDEW (PATHOGEN STRAIN HMLAC226) ON PROSTRATE KNOTWEED (POLYGONUM AVICULARE L.) AT VARIOUS LOCATIONS OF SHENYANG, NORTHEAST CHINA