APLIKASI PESTISIDA NABATI DAUN MENGKUDU (Morinda citrifolia), LENGKUAS (Alpinia galanga), DAN KUNYIT (Curcuma longa) DALAM MENGHAMBAT PERTUMBUHAN PENYAKIT ANTRAKNOSA (Colletotrichum capsici) SECARA IN VITRO

Abstract

Anthracnose disease caused by Colletotrichum capsici is one of the major constraints in chili

cultivation, as it significantly reduces yield and fruit quality. Continuous application of synthetic

fungicides may result in environmental pollution, health problems, and the development of

pathogen resistance, highlighting the need for environmentally friendly control alternatives. This

study aimed to evaluate the inhibitory effect of botanical pesticides derived from noni leaves

(Morinda citrifolia), galangal (Alpinia galanga), and turmeric (Curcuma longa) on the growth of

Colletotrichum capsici under in vitro conditions. The experiment was conducted at the Plant

Protection Laboratory of the Ketindan Agricultural Training Center using the poisoned food

technique on Potato Dextrose Agar (PDA) medium. Treatments consisted of botanical pesticide

concentrations of 0% (control), 5%, 10%, 15%, and 20%. The inhibitory activity was determined

by measuring fungal colony diameter and calculating the percentage of growth inhibition. The

results showed that botanical pesticides from noni leaves, galangal, and turmeric were able to

suppress the growth of Colletotrichum capsici, with higher concentrations resulting in greater

inhibition. These findings indicate that noni leaves, galangal, and turmeric have potential as

effective and environmentally friendly botanical fungicides for controlling anthracnose disease in

chili plants.