Tillage and crop establishment of aromatic rice's: Their influence on the population dynamics of insect pests
- Author Leovegildo B. Mante, JR
- DOI
- Country : Philippines
- Subject : Agricultural Sciences
Keywords : Aromatic rices, Tillage, Crop establishment, Insect pests, Population dynamics, Payatak /soil trampling
Abstract
A field experiment was conducted at University of Eastern Philippines (UEP) experimental area, to determine the influence of the different methods of tillage and crop establishment on the occurrence and population dynamics of insect pests; plant growth and yield response of introduce aromatic rices cultivars,Kasturi, Basmati 370 and basmati 385 and local variety kalinayan. Transplanted basmati 370 and basmati 385 in both methods of tillage produces the highest number of productive tillers; kalinayan and kasturi obtained the most non-productive tillers. Transplanted kasturi in payatak and in conventional tillage produced significally the longest panicle followed by kalinayan, basmati 385 and basmati 370. Transplanted and direct seeded kalinayan in payatak and in conventional tillage obtained the greatest filled grains followed by the conventional basmati 370 and kasturi. Transplanted basmati 370 and basmati 385 in payatak and conventional tillage produced the heaviest 1000 grain weight while kalinayan, the lightest. Transplanted basmati 370 significally obtained the highest grain yield at 4.51 t/ha. Followed by kasturi, 3.21 t/ha; kalinayan, 2.78 g/ha. And basmati, 385 2.77 t/ha. Direct seeded and transplanted kalinayan was the tallest cultivar tested, be it planted in payatak or in conventionally prepared land areas. Furthermore, kalinayan obtained the biggest leaf area index followed by basmati 385, basmati 370 and kasturi, the smallest. Direct seeded basmati 385 flowered earliest followed by basmati 370, kasturi and kalinayan. Transplanted rice had the lowest insect pest incidence. The method of land preparation did not affect insect pest incidence; however, basmati 370 was observed most resistant to insect pest infestation while basmati 385 ranked second. Kasturi and kalinayan exhibited less resistance to insect pest infestation. The dominant natural enemies monitored included wolf spider Lycosa pseudoannulata (boesenberg and strand), long horned grasshopper Conocephalus longipennis (de haan), damselfly Agriocnenis femina (Brauer), lynx spider Oxyopes javanus (Thorell), long jawed spider Tetragnatha maxillosa ( Throrell) and lady beetles Micrapis crocea (Mulsant). The low population buildup and infestation of insect pests was attributed to the high population count of natural enemies in every plant growth stage.
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