Blight in tomatoes

Research papers concerning agrohomeopathy, homeopathy (if relevant), potentised BD remedies and so forth.
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Blight in tomatoes

Post by Mark »

Effect of biotherapic of Alternaria solani on the early blight of tomato3plant and the in vitro development of the fungus

Solange Monteiro de Toledo Piza Gomes Carneiro1 Euclides Davidson Bueno Romano, Erika Pignoni, Marcus Zulian Teixeira, Maria Elizabeth da Costa Vasconcelos, José Carlos Gomes

ABSTRACT Background: homeopathy is a means permitted in organic agriculture to control disease and
plaguesQ biotherapics are a practical means for farmers to intervene on the health of plants in
agroRecological systems of production. TomatoRplants can be affected by several diseases, one of
the most significant ones in Brazil is early blight, caused by fungus Alternaria solani, due to the
damage it causes and its wide distribution in the country. Aims: to establish whether a
biotherapic of A. solani may interfere on the in vitro development of the fungus and whether it
affects the severity of early blight on tomatoRplants in greenhouse. Methods: the effect of the
biotherapic on the fungus was evaluated through the percentage of germinated spores under
microscope and the growth of colonies in a culture medium. Treatments used were: biotherapic
26cH, 27cH, 28cH, 29cH and 30cH sterilized distilled water and diluted and agitated
hydroalcoholic solution. The effect of the biotherapic on the development of disease was evaluated
in 4 experiments in greenhouse. Plants were kept in vases and subjected to artificial inoculation
of the fungus after the application of treatments. Evaluation of disease was carried out through
diagrammatic scale. Results: no treatment affected the germination of spores or the development
of fungus colonies in the culture medium. In the first test, treatment 26cH differed from water in
the second test, treatments 27cH and 28cH showed significant difference from both water and
hydroalcoholic solution with an average control of disease of 57% and 62% respectively. The other
2 tests did nor exhibit any significant effect. Conclusions: there was no direct effect of the
biotherapic on the fungus, but there was an effect on the severity of the disease. Factors affecting
the efficiency of the biotherapic must be better understood before it can be recommended to
farmers for the management of early blight in tomato plants.

Keywords: Solanum lycopersicum, Alternaria solani, isotherapy.