The presence of new pest Spodoptera frugperda J. E. Smith has the potential to reduce corn production, so its existence needs to be controlled. The aim of this research is to obtain control techniques that could reduce the intensity of S. frugiperda pest’s attack. The research was conducted from June to October 2020. The experiment was designed in a randomized block design (RBD) with 9 replications and 3 treatments consisting of non-control (NP), PHT-biointensive (BI), and synthetic pesticides. In BI treatment, neem leaf extract (25 mL/plot) and Beauveria bassiana (6,25 g/plot) were used. Meanwhile, the PS treatment used deltametrin active ingredient (3,125 mL/plot). The volume of spray used was 1,25 L. The results showed that PS control techniques gave the best results in suppressing the intensity of fall armyworm S. frugiperda attacks (0,57%-7,04%) followed by BI treatment (0%-6,89%) and NP (0,97%-8,29%). The highest pest populations overall were found in NP treatment and the lowest in PS treatment. PS treatment provided the highest production result with a cob weight of 18,6 kg/plot (24,81 tons/ha), while BI treatment of 17,00 kg/plot (22,72 tons/ha) and NP of 15,44 kg/plot (20,64 tons/ha). The results of the correlation test between the intensity of pest attacks and production results showed that the higher the pest attack, the lower the harvest weight produced. Therefore, pest control by using synthetic pesticides made from active deltametrin is declared effective in suppressing the intensity of attacks and populations of fall armyworm S. frugiperda and able to provide high production results.   Keywords: corn, intensity of attack, Spodoptera frugiperda

Kemunculan hama baru Spodoptera frugiperda dapat merusak hingga 80% tanaman jagung sebagai inang utamanya. Tujuan dari penelitian ini yaitu untuk mendapatkan konsentrasi pestisida nabati ekstrak daun pepaya terbaik yang mampu meningkatkan mortalitas ulat grayak (Spodoptera frugiperda) pada tanaman jagung. Metode yang digunakan adalah metode eksperimental dengan menggunakan Rancangan Acak Lengkap (RAL) faktor tunggal yang terdiri dari 6 perlakuan dengan 4 kali ulangan : A (Kontrol) ; B (Insektisida deltametrin 1 ml/lt) ; C (Ekstrak daun pepaya 20 g/l) ; D (Ekstrak daun pepaya 40 g/l) ; E (Ekstrak daun pepaya 60 g/l) ; F (Ekstrak daun pepaya 80 g/l). Pengaplikasian melalui pada larva. Hasil penelitian menunjukkan pemberian ekstrak daun pepaya berpengaruh terhadap mortalitas, persentase larva berhenti makan. Pemberian ekstrak daun pepaya dengan konsentrasi 80g/l memberikan mortalitas tertinggi sebesar 100,00% serta mematikan 50% larva uji lebih singkat dengan rata-rata kematian 6 jam setelah aplikasi berdasarkan analiss probit LT50. Perlakuan ekstrak daun pepaya konsentrasi 80 g/l dapat direkomendasikan untuk pengendalian hama S.frugiperda yang dapat menekan populasi larva S. frugiperda.

The entomopathogenic fungi of Beauveria bassiana is known to infect the Tribolium castaneum pest. Mass production of B. bassiana is currently carried out using alternative media, the amount of conidia produced on alternative media is quite large and can tolerate temperature. This research aims to select alternative media for the propagation of B. bassiana to gain germination, conidia density, and virulence of the best alternative media concentration against the pest of T. castaneum. The method used was a compiled in the Completely Randomized Design (RAL) at all stages of research. In the first stage of alternative media selection consisting of 4 treatments in 6 replications: A (PDA); B (peanuts); C (soybean); D (old coconut meat). The second stage of alternative media infectivity consisting of 5 treatments in 5 replications: positive control (synthesis insecticide); negative control (aquades); 107; 108; 109 spores/ml. The results achieved that alternative media selection given a highest colony diameter is 4.39 cm on soybean, the highest conidia density is 5,61 x 108 spores/ml on peanuts, the highest germinating power is 31.76% on peanuts. Furthermore, the infectivity of alternative media obtained on peanut media had a significant effect on the mortality of T. castaneum (36.00%) at a concentration of 109 spores/ml, LC50 was obtained at 5.6 x 105 spores/ml, and LT50 within 5.42 days. The results indicated that the peanut media was a good propagation medium of B. bassiana and it was necessary to find other alternatives to increase the infectivity of B. bassiana against T. castaneum.

The fall armyworm Spodoptera frugiperda becomes a significant pest of maize. The presence of these pests can be a threat because these pests have a high cruising range, high reproduction speed, and strong destructive power. Aimed of this research is to decisive the biological responses of larvae in several host plants. The method used was using four different types of host plants: maize P36 variety, spinach Retina variety, Mustard greens Tosakan variety, and green beans Vima 1 variety. The results obtained were the average attack intensity of S. frugiperda with the Choice Test showed that the highest attack intensity was 87.5% on Mustard greens Tosakan variety, not significantly different from the intensity of attack on maize varieties P36, which was 56.2%. The mortality percentage of S. frugiperda larvae in all treatments had no significant effect with the highest mortality in spinach plants (37.25%) and the lowest mortality in maize plants (18.75%). The average length of development of S. frugiperda larvae from instars 2 to 6 on various feed alternatives ranged from 1.7 days to a maximum of 3.3 days. The average percentage of the development from Larvae into Pupae showed the highest percentage on maize was 81.25% and the lowest percentage was spinach (50%). The average percentage of the development from pupae into adult showed the highest on maize plants (68.75%). Fall armyworm can also attack other hosts such as Mustard greens, spinach, and green beans. It is necessary to increase vigilance against this pest because this pest has many alternative hosts.

Salah satu faktor yang mempengaruhi dalam penurunan hasil dan kualitas ubi jalar adalah serangan hama Cylas formicarius. Cendawan entomopatogen Lecanicillium lecanii merupakan salah satu agens hayati yang dapat digunakan untuk mengendalikan berbagai jenis serangga hama. Penelitian ini bertujuan untuk mengetahui pengaruh aplikasi cendawan entomopotagen L. lecanii untuk mengendalikan imago C. formicarius. Metode yang digunakan adalah metode eksperimen dan rancangan percobaan yang digunakan adalah Rancangan Acak Lengkap (RAL) faktor tunggal yang terdiri dari 4 perlakuan dalam 6 kali ulangan : Kontrol (Aquades); 106 konidia/ml; 107 konidia/ml; 108 konidia/ml. Pengamatan dilakukan setiap hari selama 10 hari setelah aplikasi (hsa) dengan menghitung 10 imago C. formicarius yang mati akibat disemprot dengan suspensi cendawan L. lecanii sebanyak 1 ml/perlakuan. Hasil penelitian menunjukkan bahwa kerapatan konidia L. lecanii 108 konida/ml memberikan hasil paling efektif terhadap mortalitas C. formicarius sebesar 50% dengan nilai LT50 sebesar 10,024 hari. Dengan demikian, cendawan entomopatogen L. lecanii sebagai agens hayati C. formicarius layak untuk dikembangkan lebih lanjut.