Judul: Toksisitas Kontak dan Efek Fumigan Minyak Atsiri Cinnamomum spp. (Lauraceae) terhadap Tribolium castaneum (Herbst) (Coleoptera: Tenebrionidae)
Abstrak: One of the stored product pests which can reduce the quantity and quality of stored products is the flour beetle Tribolium castaneum. Stored-product pests are commonly controlled by fumigation and surface spraying using contact insecticides which can cause various harmful side effects. Essential oils of Cinnamomum spp. constitute safer alternatives for controlling stored product pests. This research was done to determine the contact toxicity and fumigant effect of essential oils of eight species of Cinnamomum and a commercial cassia oil against T. castaneum. A commercial insecticide containing alpha-cypermethrin was included for comparison. Only a commercial cassia oil had a fairly strong contact and fumigant effect, i.e. the treatment with 5% cassia oil caused 75% and 70% mortality, respectively. The other test essential oils were not active to weakly active against T. castaneum. Cassia oil and alpha-cypermethrin acted fairly fast, i.e. test insect mortality mostly occurred at 24 hours after treatment (HAT) and in the next 48 hours only a slight increase in insect mortality was noted. LC50 of cassia oil at 72 hours after treatment by contact and fumigant method was 4.73% and 3.12% respectively. Alpha-cypermethrin had relatively weak lethal effect by contact method and no fumigant effect at concentrations up to 10% but had strong knockdown effect at 5% and 10% by contact method.
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Judul: Efek Fumigan Minyak Atsiri Bunga Cengkih ( Syzygium aromaticum),Kulit Jeruk Lemon (Citrus limon), dan Daun Mint (Mentha piperita) terhadap Mortalitas Cryptolestes sp. (Coleoptera:Cucujidae)
Abstrak: Flat grain beetle, Cryptolestes sp. is a secondary pest of cereal grains in storage. Controlling this pest is commonly conducted by fumigation with phospine. Certain essential oils have the potency to be used as alternative fumigant. The aims of this research was to test the effectiveness of essential oils distilled from clove, lemon peel, and mint leaves against Cryptolestes sp. Essential oils to be tested was dripped onto 10 mm filter paper, air dried, and sticked on to inside part of petri dish cap. Twenty tested insects and their food then transferreed into petri dish, the petri dish then covered with its cap and sealed with plasticine to make it gastight. Mortality of test insects was observed after 72 hours. The results showed that clove essential oil caused 94% mortality at the dose of 0.02 ml/l of air, lemon oil that caused 70% mortality at the dose of 0.2 ml/l of air, and mint oil caused 94% mortality at the dose of 0.04 ml/l of air.
Keyword: Bogor Agricultural University (IPB), mortality, flat grain beetle, fumigant, Essential oils

Judul: Peran Pemuda dalam Pembangunan Masayarakat Pedesaan (Kasus Penelitian Desa-desa Wilayah Perkotaan, Pinggiran dan Pedesaan Kabupaten Malang Jawa Timur)
Abstrak: Peran adalah perilaku yang diharapkan sesuai dengan hngsi atau kedudukannya. Perilaku yang dilakukan pemuda adalah belajar dan berlatih serta berpartisipasi aktif dalam pembangunan. Belajar dan berlatih adalah proses pengembangan diri. Partisipasi aktif dalam pembangunan masyarakat pedesaan merupakan proses pematangan diri. Dengan cara demikian diharapkan mereka (pemuda) kelak menjadi matang dalam menghadapi berbagai gerak pembangunan masyarakat pedesaan di desanya.
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