Common insect post and diseases of Jatropha curcas in the locality of Northern Samar, Philippines
2009
Tuan, L. | Sotto, J.M.E.O. | Llano, A. | Punsalan, M.R.O. | Ultra, V.U., [email protected] | Galo, E.A. | Sanico, J.F., University of Eastern Philippines, University Town, Northern Samar (Philippines)
A field survey was conducted to monitor and identify common insect pests and diseases of Jatropha curcas as part of the research project geared toward the sustainable establishment of jatropha in Northern Samar. Identification of the diseases of J. curcas was conducted in two plantations in University of Eastern Philippines (UEP) and San Roque, Northern Samar. Fungal pathogens were isolated and characterized based on the Illustrated Genera and Species of Plant Pathogenic Fungi in the Tropics. Leaf spot and marginal necrosis were the common fungal diseases observed in all sample plants at the two plantation sites. Leaf spot however was more severe than the marginal necrosis because an average of 13.7 or 14 leaves per plant are infected with leaf spot as compared to marginal necrosis with only 2 leaves per plant. The causal organism of leaf spot was Cordana musae while that of marginal necrosis was Chlaropsis thielavioides. No bacterial disease has been observed in the sample plants in the two sites. Nematodes isolation was done using Baermann funnel technique and revealed that soil samples taken from the rhizosphere are infected with Monochoide and Aphelenchoides bessey. Similarly, monitoring, collection and identification of insect pests of Jatropha curcas was conducted by means of visual observation, umbrella beating, insect net and light trap. Results showed that trips were the most dominant among the insect pests present at the Jatropha plantation. Severe infestation of this pest causes stunted growth, yellowing of leaves and defoliation. Sap sucking insects like the bugs field crickets and leaf-chewing grasshoppers were not as abundant. Overall, this study therefore concludes that Jatropha plants can be damaged severely by thrips and be infected with fungal pathogens, Cordana musae and Chlaropsis thielavioides.
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