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- Table 1.
Selected biostimulants applied to horsechestnut (Aesculus hippocastanum) and Rosa “Pretty Polly” to control Guignardia leaf blotch and black spot, respectively.
Product Active ingredient Supplier Maxicrop Original Seaweed extract Maxicrop (UK) Ltd, Corby, UK Resistim Betaine Mandops UK Ltd, Eastleigh, Hampshire, UK Bioplex Seaweed + humic acid extract United Agri Products Ltd, Alconbury Weston, UK Fulcrum CRV Molasses Banks Cargill Agriculture Ltd, St Hughs, Lincoln, UK Redicrop Seaweed (cytokinin activity) United Agri Products Ltd, Alconbury Weston, UK Crop Set Lactobacillus fermentation product and B5 vitamins United Agri Products Ltd, Alconbury Weston, UK Superthrive Vitimin B and Auxin (NAA) Bartlett Tree Research Laboratory, Charlotte, NC Systhane Myclobutanil (triazole) Barrettine, St Ivel Way, Warmley, Bristol - Table 2.
Foliar pathogen severity rating on foliar tissue of horsechestnut (Aesculus hippocastanum) and Rosa “Pretty Polly.”
Treatment Concentration per liter Horsechestnut leaf blotch severity rating Black spot severity rating Water (control) - 4.9 ± 0.56a 4.2 ± 0.30a Maxicrop Original 10 ml 4.7 ± 0.54a 4.3 ± 0.33a Maxicrop Original 20 ml 5.1 ± 0.58a 4.0 ± 0.29a Resistim 10 ml 4.8 ± 0.46a 3.8 ± 0.31a Resistim 20 ml 5.2 ± 0.53a 4.2 ± 0.32a Bioplex 10 ml 4.9 ± 0.52a 4.0 ± 0.33a Bioplex 20 ml 4.7 ± 0.47a 4.0 ± 0.27a Fulcrum CRV 10 ml 5.2 ± 0.61a 3.7 ± 0.31a Fulcrum CRV 20 ml 4.8 ± 0.50a 3.7 ± 0.25a Redicrop 10 ml 5.0 ± 0.56a 4.4 ± 0.33a Redicrop 20 ml 4.8 ± 0.55a 4.3 ± 0.37a Crop Set 10 ml 5.0 ± 0.58a 4.5 ± 0.34a Crop Set 20 ml 4.6 ± 0.60a 4.1 ± 0.38a Superthrive 0.25 ml 4.5 ± 0.40ab 4.0 ± 0.29a Superthrive 0.50 ml 4.2 ± 0.33ab 4.2 ± 0.31a Systhane 0.3 ml 1.3 ± 0.18c 1.4 ± 0.04b Systhane 0.6 ml 1.0 ± 0.14c 1.2 ± 0.03b Note: 1 = No pathogen attack observed; 2 = less than 5% of leaf area affected; 3 = 5%–20% of leaf area affected with some chlorosis; 4 = 21%–50% of leaf area affected, significant leaf chlorosis; 5 = 51%–80% of leaf area leaves affected, severe leaf chlorosis; 6 = 81%–100% of leaf area with complete leaf chlorosis. All values mean of six plants. Values followed by the same letter are not statistically significant (P ≤ 0.05) according to LSD.
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