Comparative performance of entomopathogens against the rice bug, Leptocorisa oratoria (Fabricius), in Eastern Visayas [Philippines]. 2. field efficacy and cost-and-return analysis
2019
Almeroda,B.B. | Dela Cruz, C.S.
Metarhizium anisopliae (Metsch.) Sorok.SPW isolate and Beauveria bassiana (Bals.) Vuill. were evaluated under field conditions against the rice bug, Leptocorisa oratoria (Fabricius). Cost and return analysis of the production of the two entomopathogens was also conducted. M. anisopliae SPW and B. bassiana isolates infect both nymphal and adult stages of rice bug. Infected rice bug exhibited whitish mycelial growths in the ventral portion of thorax and on the bases of the legs, 3-7 days after application. Highest observed nymphal infection in the laboratory of B. bassiana and M. anisopliae were 88.33 and 96.67% respectively, seven days after application. On the other hand, under screenhouse conditions, adult rice bugs succumbed to 85% infection by B. bassiana but only 57.50% infection by M. anisopliae SPW. Using palay as substrate for the two entomopathogens lowered production cost per bag of PhP 18.59 and was more economical than cracked corn i.e., PhP 21.59 per bag. In the field, use of entomopathogens significant reduced rice bug population. However, its efficacy was hampered when applied during rainy season. Pesticide application done by farmers incurred 115.16% higher cost compared with the production cost per bag when using Metarhizium.
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