Persentase Serangan dan Kerusakan Penggerek Batang Cengkeh (Hexamitodera semivelutina Hell.) Berdasarkan Perbedaan Umur Tanaman Cengkeh di Kabupaten Minahasa Selatan

Abstract

The purpose of this study was to determine the percentage of attack and damage to the clove stem borer Hexamitodera semivelutina on clove plants of different ages in Wuwuk Village, South Minahasa Regency. This study was carried out for four months, starting from August to November 2022. The research method used is the survey method, namely by making direct observations at the research location. The number of clove trees as plant samples observed for each location amounted to 20 plant trees selected based on plant age. The number of observation location points is six clove  in Wuwuk Village so that the total number of sample plants to be observed is 120 plants and multiplied by two as the difference in plant age, namely  10 yearsand  10 years, the total number of plants to be observed is 240 trees Observations of the percentage of attack and damage by clove stem borers were distinguished at two plant ages, namely  10 years old and  10 years old. Based on the results of the study that the percentage of clove stem borer H. semivelutina attacks in the  10-year-old clove plant population ranged from 15-30% with an average of 22.5%, while in the  10 years old clove plant population ranged from 45-60% with an average of 52.5%. Damage based on active holes in the population of  10 years old clove plants in active holes ranged from 3-6 holes with an average of 4.6 holes and for inactive holes ranged from 0-2 active holes with an average of 0.83 active holes while damage at  10 years old in active holes ranged from 6-9 holes with an average of 7.1 holes and for inactive holes ranged from 5-8 holes with an average of 6.1 holes.