The consortium biostimulant combines several types of biostimulant applied holistically, such as phytohormones to induce physiological processes, humic acid to improve nutrition intake and land fertility, and biofertilizer arbuscular mycorrhizal fungi to improve abiotic stress tolerance. The objectives of this research were to analyze the effect of application consortium biostimulant on the growth and productivity of Bululawang sugarcane variety planted in three land typologies, i.e. irrigated heavy soil with good drainage (BPL), irrigated heavy soil with poor drainage (BPJ), and rainfed light soil with good drainage (RHL). The research was conducted on plant cane (PC) sugarcane areal in Lumajang Regency, East Java, from July 2019 to September 2020. The treatment plot area was 1 ha for each land typologies, and the observation were conducted on 10 m plant row with ten times replications. Each treatment was replicated ten times. The results showed that the application of consortium biostimulant could induce faster growth of sugarcane shoots and better roots at one month after planting (MAP). Stalk height and diameter showed significantly different values between treatment and control at the plant age 6 to 12 MAP. In addition, the sugarcane stalk weight per meter row also increases by 13.72 – 28.57%. The growth performance of sugarcane on a commercial scale increased, also sugarcane productivity increased by 11.08 – 20.36%. The potential sugar yield increased by 15.05% in BPL land typology, 4.9% in BPJ land typology, and 9.7% in RHL land typology. The difference in land typologies affected the effectiveness of the consortium biostimulant application in increasing sugarcane productivity.

Corn, an important crop in Indonesia still has a low productivity, thus many efforts are required to fulfill its national demand. One of the solutions to improve corn yield is by applying biostimulant containing chitosan as an active ingredient. Chitosan has been proved to increase plant growth and resistance against diseases. The objective of this research was to study the effects of several chitosan formulas on the yield and diseases occurance in sweet corn (Zea mays var. Bonanza). The chitosan formulas tested were soluble liquid(SL), wettable powder (WP), nano chitosan (NN), and unformulated chitosan (CH). The experiment was arranged using a randomized block design with three replications. All chitosan formulas were applied by seeds soaking for 20 minutes, followed by foliar spraying on corn plants at three weeks after planting (WAP), with the concentration of 500 ppm (400 L/ha spray volume), every threeweeks until 9 WAP. Parameters observed were brix value, weight of corn cobs, weight of corn biomass, and plant diseases including downy leaves, leafblight and leaf rust. The results showed that NN formula increased the brix value up to 7%, the corn cob weight up to 49% and the biomass weight upto 34% compared to the control; whereas SL formula reduced the incidence of downy mildew by 53% at 3 WAP and leaf blight disease by 51% at 6 WAP. In addition, the incidence of corn leaf rust reduced 59-71% in corn plant subjected to all chitosan formulas. Based on the results, application of chitosan in NN formula was best in increasing yield, while in SL formula was best in reducing the incidence of important corn diseases.[Keywords: downy mildew, chitosan formula, seed treatment]AbstrakJagung sebagai salah satu komoditas pangan penting di Indonesia masih memiliki produktivitas yang rendah sehingga diperlukan usaha untuk memenuhi kebutuhan jagung nasional. Salah satu cara untuk meningkatkan hasil jagung adalah dengan aplikasi biostimulan yang mengandung bahan aktif kitosan. Kitosan telah terbukti mampu meningkatkan pertumbuhan dan daya tahantanaman terhadap penyakit. Penelitian ini bertujuan mempelajari pengaruh beberapa formula kitosan terhadap hasil dan kejadian penyakit pada tanaman jagung manis (Zea mays var. Bonanza). Formula kitosan yang diuji adalah cairan yang dapat larut (soluble liquid, SL), tepung yang dapat dibasahi (wettable powder, WP), nano kitosan (nano chitosan, NN), dan kitosan non formulasi (unformulated chitosan, CH). Percobaan dilakukan menggunakan rancangan acak kelompok (RAK) dengan tiga ulangan. Masingmasing formula kitosan tersebut diaplikasikan melalui perendaman benih selama 20 menit yangdiikuti dengan penyemprotan daun pada tanaman jagung berumur tiga minggu dengan konsentrasi 500 ppm (volume semprot 400 L/ha) yang dilakukan setiap tiga minggu sampai tanaman berumur sembilan minggu. Parameter yangdiamati adalah nilai brix, bobot tongkol jagung, bobot biomassa jagung, dan penekanan kejadian beberapa penyakit tanaman meliputi bulai, hawardaun, dan karat daun. Hasil penelitian menunjukkan bahwa aplikasi kitosan NNmeningkatkan nilai brix jagung manis hingga 7%, bobot tongkol jagung hingga 49% dan bobot biomassa hingga 34% dibandingkan dengan kontrol. Sementara itu, aplikasi kitosan SL dapat menekan kejadian penyakit bulai hingga 53% padaumur tanaman 3 minggu setelah tanam (MST) dan penyakit hawar daun hingga 51% pada umur 6 MST. Selain itu, kejadian penyakit karat daun jagung juga dapat ditekan 59-71% pada aplikasi keempat formula kitosan. Berdasarkan hasiltersebut, aplikasi kitosan NN paling optimal dalam meningkatkan hasil panen jagung manis, sedangkan aplikasi kitosan SL paling optimal dalam menekan kejadian beberapa penyakit pada tanaman jagung.[Kata Kunci: bulai, formula kitosan, perlakuan benih]

Indonesia is the third largest cocoa producer in the world, thus the number of cocoa pod husk (CPH) resulted from this activity is abundant. To handle this waste, farmer usually uses it directly as a feed source to small ruminants but this practice is less effective due to its low protein content and it also contains a substantial amount of lignin. Black Soldier Fly (BSF) (Hermetia illucens L.) (Diptera: Stratiomyidae) larvae are known as bioconversion agents that can be fed upon various organic substrates and they are also high protein source. The aim of this research was to evaluate the possibility of BSF grown on CPH based on their relative growth rate (RGR), efficiency of conversion of ingested food (ECI), waste reduction index (WRI), and development time. Body size of the imago from each treatment was also measured. Larvae were fed with fresh CPH (F), fresh blended CPH (B), composted CPH (C), mix of fresh CPH with food waste (F+FW) and mix of composted CPH with food waste (C+FW). Food waste served as a control. The results of this study show that the most ideal treatment that possible to be applied in cocoa plantation was C+FW treatmentwhich gave average prepupal fresh weight of 11.20 g/100 larvae with 18 days of development time. This treatment had the highest value of WRI and RGR among all treatments. Composted CPH that mixed with food waste treatment also had a shorter development time of BSF larvae.

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ABSTRAKStroberi termasuk tanaman buah baru yang masuk ke Indonesia, stroberi dengan cepat berkembang karena permintaan akan buah ini terus meningkat. Trips merupakan salah satu hama yang menyerang tanaman stroberi dan dapat mengurangi kualitas serta kuantitas produksi stroberi. Penelitian dilakukan di Desa Alamendah, Kecamatan Rancabali, Kabupaten Bandung dari bulan Maret sampai Agustus 2012. Trips yang menyerang tanaman stroberi di Desa Alamendah didominasi oleh Frankliniella intonsa (Trybom). Trips lain yang ditemukan pada tanaman di sekitar tanaman stroberi, yaitu Thrips palmi dan Microcephalothrips abdominalis. Kedua trips ini ditemukan pada tanaman tomat, kentang, bawang daun, blackberry, gulma Amaranthus sp. dan Ageratum haustonianum. Seluruh stadia pertumbuhan F. intonsa berada pada bunga stroberi dengan kerapatan populasi berkisar dari 1,8 sampai 2,3 individu imago/bunga. Luas serangan F. intonsa di lahan stroberi berkisar antara 68,4% sampai 82,2%. Berdasarkan uji kemampuan F. intonsa menyerang tanaman stroberi, menunjukkan bahwa 43,3% buah sampel yang dipanen mengalami malformasi pada bagian ujung buah. Dengan demikian F. intonsa berpotensi menjadi hama penting tanaman stroberi. ABSTRACTStrawberry is a new crop in Indonesia, and it has been developed because of its high demands.Thrips is one of the strawberry pest that can reduce quality and quantity strawberry productions. The research was conducted in Alamendah-Rancabali Village, Bandung District from March to August 2012. Thrips species that attack strawberry in Alamendah Village dominated by Frankliniella intonsa (Trybom). Other thrips that were found on plants surround strawberry field is Thrips palmi and Microcephalothrips abdominalis. Both of these thrips are found on tomatoes, potatoes, leek, blackberries, weeds (Amaranthus sp. and Ageratum haustonianum). The complete stadia of F. intonsa were found on strawberry flowers. Population densities in the field were found to be between 1.8 to 2.3 individual/flower. Around 68.4%-82.2% of the fields are are infested with F. intonsa. Based on *Penulis korespondensi: Dewi Sartiami. Departemen Proteksi Tanaman, Fakutas Pertanian,