<p>Untuk mengurangi penggunaan pestisida di perkebunan teh, maka salah satu upaya pengendalian hama yang dapat dilakukan adalah mengkombinasikan aplikasi pestisida dengan jamur entomopatogenik. Penelitian ini bertujuan untuk mengetahui kompatibilitas antara jamur <em>P. fumosoroseus </em> dengan beberapa bahan aktif pestisida di laboratorium. Perlakuan dirancang dengan Rancangan Acak Lengkap (RAL) terdiri dari 5 jenis bahan aktif yaitu metomil, bifentrin, imidakloprid, tembaga oksida dan metidation pada taraf konsentrasi sesuai rekomendasi lapang (RL), 0,5x RL dan 2x RL. Hasil pengamatan menunjukkan bahwa diantara kelima jenis bahan aktif pestisida yang diuji, metidation memiliki tingkat toksisitas yang paling tinggi. Persentase produksi spora tertinggi sebesar 13,77% ditunjukkan oleh perlakuan bifentrin 2x RL.</p><p> </p><p><span lang="IN">Combining application of </span><span>pesticides and entomopathogenic fungi </span><span lang="IN">is </span><span>an alternative way for controlling pest </span><span lang="IN">in order to </span><span>reduce pe</span><span lang="IN">s</span><span>ticides application in the tea field. This research </span><span lang="IN">was aimed to</span><span lang="IN">examine</span><span> the compatibility </span><span lang="IN">of </span><em><span>Paecilomyces fumosoroseus</span></em><span lang="IN"> to</span><span lang="IN">some</span><span> active agents of pesticide in laboratory. Completely Randomized Block Designed (CRBD) with 5 active agents: methomyl, bifenthrin, imidacloprid, copper oxide and metidation in three </span><span lang="IN">different concentration was employed in this study, which was based on the existing </span><span>field recommendation (FR)</span><span lang="IN">:</span><span> 0,5x FR and 2x FR. The results showed that a</span><span>mong the five tested pesticides</span><span lang="IN">,</span><span> metidation appear</span><span lang="IN">ed</span><span> to be </span><span lang="IN">the </span><span>mo</span><span lang="IN">st</span><span> toxic agent</span><span>to <em>P. fumosoroseus</em>. </span><span lang="IN">Meanwhile, the highest </span><span>percentage of spore </span><span lang="IN">production was </span><span>count</span><span lang="IN">ed in</span><span> bifenthrin 2x RL (13,77%</span><span lang="IN">.</span><span>)</span></p>