Page 31 - Abstract book - TJSSF-2020

Thailand – Japan Student Science Fair 2020 (TJ-SSF 2020)
“Seeding Innovations through Fostering Thailand – Japan Youth Friendship”

Oral and Poster Presentation
Section B : Biology

Test of the efficacy of crude extracted from betel leaves to the
control
rice blast disease in rice field.

Chonlada Chaiyotha , Jirathip Saeoui
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Advisor: Nurhidayah Kahong
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Princess Chulabhorn Science High School Buriram
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Abstract
Rice is an important economic crop and is a staple food for 2.7 billion people in Asia. But the problem
is the epidemic of rice that is heavily caused by rice blast disease by Pyricularia oryzae. Prevalent in
many countries such as Japan, Vietnam, Korea and many countries in Asia. Including Thailand, has
spread in every area throughout the country causing not being able to control the spread of the infection
as well as it should. From the comparison of the efficacy of crude extracted from between betel and
guava leaves to inhibit the growth of the rice blast disease the findings indicated that betel leaves had
more effective inhibition than guava leaves. Which can inhibit 100% of fungus of rice blast disease at
concentrations of 1000 ppm and 1500 ppm. And crude extracted of betel leaves use 95% ethanol as a
solvent, with the lowest concentration that can inhibit the infection 100% is 100 ppm is more effective
in inhibiting the growth of rice blast disease better than the crude extracted from betel leaves use water
as a solvent with the lowest concentration that can inhibit the infection 100% is 500 ppm. And when
tested in the control of rice blast disease in the field can reduce the incidence of disease from level 3 to
level 1. And the storage of crude extracted from betel leaves at 4°C and 28°C can remained effective
and the physical characteristics remained unchanged. And the chemical composition of the crude
extracted from betel leaves is Eugenol. From the above information, it can be developed into a product
to the community. And to encourage farmers to use local herbs to maximize benefits. It also helps to
reduce the import of chemicals and protect the environment contamination in another way.

Keywords: rice blast disease, crude extracted from betel leaves, Pyricularia oryzae

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