ABSTRAKBudidaya tanaman pakoba (Syzygium luzonense (Merr.) Merr.) di persemaian ditemui kendala berupa serangan ulat jengkal (Hyposidra talaca Wlk). Gejala yang ditimbulkan berupa lubang-lubang pada daun terutama daun muda sampai menyerang habis daun-daun bibit pakoba. Serangan hebat dapat menyebabkan kematian bibit. Terdapat lima blok di pembibitan pakoba yang diamati dengan jumlah total bibit sebanyak 1014 bibit. Presentase serangan ratarata yang diakibatkan oleh ulat ini cukup tinggi yaitu mencapai 49,34 %. Upaya pengendalian serangan ulat jengkal dapat dilakukan dengan cara pendekatan pengendalian terpadu. Penanggulangan hama ulat jengkal yang telah dilakukan di persemaian adalah dengan cara kimiawi menggunakan insektisida berbahan aktif profenofos dengan dosis setengah dari dosis normal. ABSTRACTObstace of pakoba (Syzygium luzonense (Merr.) Merr.) cultivation in nursery is twig caterpillar (Hyposidra talaca WLK) attacks. The Pest symptoms was holes in the leaves especially young leaves; twig caterpillar enable to attack all leaves of pakoba seed. Severe attacks cause death of seedlings. There are five blocks in pakoba nursery that were observed; 1014 pakoba seedlings were grown in these blocks. The average percentage of twig caterpillar's attack was quite high, reached 49.34%. Twig caterpillar has been controlled by integrated pest management. Chemical control to decrease twig caterpillars attack in nursery has been done by using half dose of insecticide profenofos.

Matoa (Pometia Pinnata J.R. Forster & J.G. Forster) is one of potential multipurpose tree species for forest and land rehabilitation program in North Sulawesi. Limited information on the technique of cultivation of matoa often become an obstacle for development, especially seed storage techniques because of all the seed are not always directly sown after collection. This study aims to determine the effect of time and storage media on the viability of matoa seeds. The design used in this study was complete randomly design arranged in factorial, consisting of (two) main factors : 1) storage time and 2) storage media. The storage time consists of three levels : 5 days, 10 days and 15 days. Storage media consists of four levels : aluminium foil, calico cloth, cocopeat and without storage media. The results showed that the aluminium foil is the best storage media that can be used to store the matoa seeds up to 15 days.

Langusei (Ficus minahassae (Teysm.et.Vr.) Miq) is one of the endemic flora of Sulawesi which existence is increasingly threatened. Attempts to maintain the existence of Ficus minahassae species by understanding the cultivation techniques of the Langusei species, especially regarding the appropriate germination techniques, need to be addressed. This study aims to determine the level of fruit maturity and the appropriate extraction treatment for the germination of Langusei seeds. The experimental design used in this study was a complete randomization design which is arranged in a factorial pattern. The first factor is the classification of the level of seed maturity based on fruit color categories: 1) Orange-brown fruit, 2) Orange-reddish fruit, 3) Red fruit, and 4) Red-black fruit, while the second factor is the fruit extraction treatment which consists of: 1) Extraction with dry wind treatment for 24 hours, 2) Extraction with drying treatment for 12 hours, and 3) Extraction with water treatment for 24 hours. The results showed that the fruit maturity level and the appropriate extraction treatment to produce optimal Langusei seed germination were in the (orange-brown and orange-reddish fruit) (mature fruits prior to ripening) which was soaked in water for 24 hours.

Cempaka wasian (Magnolia tsiampaca (Miq.) Dandy) is one of the most popular carpentry woods in North Sulawesi. The development of cempaka wasian species is constrained by the inability of seeds to be stored for a long period of time. The purpose of this research was to determine the effect of different storage periods and conditions towards seed germination of cempaka wasian. The experimental design used completely randomized factorial design with two main factors as follow: storage condition and storage periods. The results showed that the conditions and storage periods had an effect on seed water content, germination rate, and seed vigor index of cempaka wasian seeds, but it did not affect the germination capacity. The storage conditions of air condition room (temperature 18ºC-21ºC, relative humidity 51percent-61 percent) was the most ideal condition for storing cempaka wasian seeds. Cempaka wasian seeds are included in the category of intermediate seed because the treatment of the storing period for 4 (four) weeks did not affect the germination capacity even though the water content of the seeds has decreased.