Assessing status of pests and diseases with cluster approach - A case of coconut in Kasaragod district in Northern Kerala
<p>The main objective of integrated pest and disease management is to intervene efficiently to reduce crop damage at minimum cost<br />and inflicting minimum damage to the environment. The basic requirement for such programmes is the availability of a costeffective<br />sampling method for assessing the status of incidence and intensity of the disease/pest attack wherein, accurate estimates<br />is achieved through minimum efforts. In the present study, a sampling strategy and measures of severity and crop loss for<br />simultaneous assessment of incidence of major pests and diseases of coconut were formulated and implemented in Kasaragod<br />district of Kerala. The sampling methodology involved a cluster approach in which four clusters of at least 500 bearing palms<br />from a minimum of ten coconut gardens, representing the geographical strata of the panchayath, were scored visually for the<br />incidence of major pests and diseases. District level estimates were derived incorporating area under coconut in each panchayath<br />as the weight. Information on geographic coordinates was recorded and utilized for preparation of thematic maps using Arc-GIS.<br />Further, crop loss due to the major pests and diseases were also estimated under certain scenarios. The study revealed that diseases<br />like stem bleeding and Thanjavur wilt were more prevalent in areas experiencing high temperature and low rainfall whereas,<br />incidence of bud rot disease was significantly higher in hilly regions where low temperature and high humidity prevailed. Incidence<br />of pests like eriophyid mite and coreid bug was higher in coastal areas of the district. The study could serve as a model for similar<br />studies in future and the information emerging out of this study would help in formulating integrated pest and disease management<br />programmes at grass root level.</p>