The Use of Film-Forming Polymers to Control Guignardia Leaf Blotch and Powdery Mildew on Aesculus hippocastanum L. and Quercus robur L.

Influence of film-forming polymers and a fungicide treatment on disease severity of Guignardia leaf blotch on horsechestnut growing under field conditions. All values mean of five trees. Asterisk indicates values significantly different from controls according to LSD (0.802) at P < 0.05; no annotation indicates values not significantly different from control value. Significance of film-forming polymer P < 0.001 (ANOVA effect).

Influence of film-forming polymers and a fungicide treatment on tree vitality of English oak as measured by chlorophyll fluorescence Fv/Fm ratios growing under field conditions following powdery mildew infection. All values mean of five trees, six leaves per tree. Asterisk indicates values significantly different from controls according to LSD (0.0754) at P < 0.05; no annotation indicates values not significantly different from control value. Significance of film-forming polymer P < 0.001 (ANOVA effect).

Influence of film-forming polymers and a fungicide treatment on tree vitality of horsechestnut oak as measured by chlorophyll fluorescence Fv/Fm ratios growing under field conditions following Guignardia leaf blotch infection. All values mean of five trees, six leaves per tree. Asterisk indicates values significantly different from controls according to LSD (0.103) at P < 0.05; no annotation indicates values not significantly different from control value. Significance of film-forming polymer P < 0.015 (ANOVA effect).

Influence of film-forming polymers and a fungicide treatment on leaf chlorophyll content of English oak growing under field conditions following powdery mildew infection as measured by a handheld SPAD meter. All values mean of five trees, six leaves per tree. Asterisk indicates values significantly different from controls according to LSD (5.118) at P < 0.05; no annotation indicates values not significantly different from control value. Significance of film-forming polymer P < 0.001 (ANOVA effect).

Influence of film-forming polymers and a fungicide treatment on leaf chlorophyll content of horsechestnut growing under field conditions following Guignardia leaf blotch infection as measured by a handheld SPAD meter. All values mean of five trees, six leaves per tree. Asterisk indicates values significantly different from controls according to LSD (3.910) at P < 0.05; no annotation indicates values not significantly different from control value. Significance of film-forming polymer P < 0.001 (ANOVA effect).