Tingkat Kesukaan Hama Plutella xylostella dan Belalang (Locusta migratoria) Terhadap Tanaman Kubis Bunga (Brassica oleracea var. botrytis L.) Dataran Rendah yang diberi Kompos Azolla dan Pupuk NPK

Abstract

This study aims to study (1) the level of Plutella pest preference, and (2) the level of grasshopper (Locusta sp) pest preference for lowland cabbage (Brassica oleracea var. Botrytis L.) on various combinations of Azolla compost and NPK fertilizer. The research was carried out in the Horticulture practice land of Lampung Polytechnic in July 2018 to September 2018. The study was arranged in factorial in a randomized block design (RBD) with 9 treatment combinations and 3 replications, so that there were 27 experimental units. The combination of treatment is as follows: The first factor is Azolla bulk compost (A) which consists of 3 levels of dosis namely: a1 = 2 tons Ha-1, a2 = 4 tons Ha-1, and a3 = 6 tons Ha-1. The second factor is the dosage of NPK fertilizer (B) which consists of 3 dosage levels, namely b1 = 0 kg ha-1, b2 = 100 kg ha-1 and b3 =200 kg ha-1. Observations were made on the intensity of Plutella xylostella and Grasshopper (Locusta sp) attacks. at the age of 17 days (1) and age 24 days (2). The data was tested by F test and the difference in treatment was followed by the smallest real difference test (LSD) level of 5%. The results obtained from the F test on the variable intensity of Plutella xylostella attack (1) were observed: azolla and NPK compost doses affected the intensity of xylostella plutella attack at the age of 17 days, while at 24 days the dose of azolla and NPK compost had no effect on pest attack this. So until the age of 17 days the administration of azolla and NPK compost still causes pests. Xylostella plutella likes flower cabbage leaves, while at the age of 24 days the flower of cabbage leaves has not been favored by these pests. For locust pests (Locusta sp), azolla dose and azolla interaction with NPK fertilizer significantly affected the attack of locust pests (Locusta sp) on cabbage flowers aged 17 days, while at the age of 24 days, only NPK doses affected the locust attack on flower cabbage plants. Thus, the adequacy of nitrogen nutrient supply causes high Plutella xylostella pest preference until the plant age of 17 days and decreases in plant age of 24 days, while for locust pest (Locusta sp) the level of preference continues until the plant age of 24 days. Keywords: Azolla compost, NPK Fertilizer, Plutella xylostella, Grasshopper (Locusta sp), Cabbage Flower