www.Primo.com: You Know Walang Sangit.

Walang sangit (Leptocorisa oratorius Fabricius, (Hemiptera: Alydidae); syn. Leptocorisa acuta) is an insect pest that became important in the cultivation of crops, especially rice. In Indonesia, this insect is called: sloth (West Java), pianggang (Sumatra), and quiet (Madura). These animals are easily recognizable from its elongated shape, measuring about 2 cm, gray brown, and has a "trunk" (proboscis) for sucking plant fluids. Walang sangit is of the order Hemiptera (true Ladybugs nation).
Walang sangit suck sap from the flower stalk (paniculae) and also liquid rice fruits that are still at the stage of cooking the milk, causing crop nutrient deficiencies and yellowing (chlorosis), and slowly weakened.
The name of these animals show a form of defense himself, which issued a stinging scent nose (so-called "sangit"). Actually, not only walang sangit that issued this aroma, but also many other Alydidae members.

Behavior and control interference.

Female insects produce 100-200 eggs, which are laid on the flag leaf of rice. His nymph green, which gradually becomes brown, and experiencing molting five times. Stadia nymphs occurred during 17-27 days. At suitable conditions, imago can live up to 115 days. Nymph and imago attack rice ripe fruit milk by sucking liquid fruit, so the fruit becomes empty. In the former stitches, raised a white patches caused by the fungus Helminthosporium. How to control it is by planting simultaneously, sanitation plants are attacked, or by spraying insecticide according to the recommended dosage.

Description Morphology and BioEkologi Walang Sangit (Leptocorisa oratorius) on Rice.

Walang sangit (Leptocorisa oratorius L) is one of the pests that attack rice plants. Symptoms of attack in the form of rice grains were empty because it was eaten away. This pest is now a common pest of rice crops and spread rapidly in all regions of the world.
In Indonesia walang rice pest is a pest potential at certain times become an important pest and can cause yield losses reach 50%. Alleged that the population of 100,000 birds per hectare can reduce up to 25% results. The results showed a population walang sangit 5 mice per 9 clumps of rice will decrease 15% results. The relationship between population density walang sangit with decreased results indicate that the attack of the tail walang per panicle rice pest in one week can reduce the results of 27%.

Morphological characters Walang Sangit (Leptocorisa oratorius).

Kingdom: Animalia, Phylum: Arthropoda, Class: Insecta Order: Hemiptera, Family: Alydidae, Genus: Leptocorisa, Species: oratorius
Walang sangit (Leptocorisa oratorius) general morphology composed of antenna, caput, thorax, abdomen, front legs, back legs, front wing and rear wing. These insects have a hard front wings, thick and without veins. Membranus-type rear wing and folded under the wings of the insect while resting. The type of tool that is biting-chewing mouth with well developed mandibular capabilities. In some species, especially from the tribe formed Curculionadae tool muzzle his mouth formed at the front of the head.
Walang sangit young green leaves that resemble the colors to deceive the enemy and do not have the ability to fly. While the adult sangit Walang brown and have a good ability to fly. In general, walang sangit slim body shape, long legs and antennas. Walang rice pest eggs are round and flat, blackish brown. Laid eggs lined up, in one or two rows of eggs amounted to 12-16 grains.

BioEkologi.

Besides rice, walang sangit also have alternative host plants in the form of grasses, among others: Panicum spp; Andropogon sorghum; Digitaria consanguinaria; Eleusine coracoma; Setaria Italica; Cyperus polystachys, Paspalum spp; and Pennisetum typhoideum.
Walang sangit (Leptocorisa oratorius) undergo simple metamorphosis begins development of stadia egg, nymph and imago. Walang sangit adults lay eggs on the upper leaves of the plant, especially in the area of the flag leaf of rice plants. 57-day old egg-laying period with a total production of eggs per stem + 200 grains. 7 days old egg stadia, there are five instar growth befallen the total length + 19 days. Preoviposition + 21 days long, so long the life cycle of the pest walang sangit + 46 days.
The eggs hatch into nymphs active after moving into the panicle rice grains are still looking stadia as eat, cook milk. And adult-befallen befallen on a hot day hiding under the canopy of the plants. Adult insects active in the morning to fly from clump to clump while the cost is relatively much happened in the afternoon or evening.
Walang mature rice plants flowering sangit moved to rice crops and breed a generation before the rice crop is harvested. The number of generations in a single stretch of paddy crop depends on the length and number of intervals of rice planting in the overlay. The more simultaneous planting the fewer the number of generations of pests walang sangit development.

The natural pest known walang sangit attacked by two types namely egg parasitoid Gryon nixoni Mesner and O. malayensis Ferr. The second parasitism parasitoids in the field below 50%. Observations were conducted in 1997 and 2000 in several areas in West Java showed parasitoid G. nixoni more dominant than the parasitoid O. malayensis. Parasitoid O. malayensis only found in rice planting areas in a rather mountainous area where many ditanaman besides rice planting crops such as soy beans or O. malayensis besides attacking eggs walang rice pest also attacks the eggs of pests and Nezara viridula Riptortus linearis which is a major pest of soybean plants. Various types of spiders and grasshoppers family Gryllidae and Tettigonidae be walang sangit pest predators. Fungus Beauveria sp is also a natural enemy walang sangit. This fungus attacks befall stadia and adults.

Environmental Factors.

Optimal temperature:

The optimal temperature for the proliferation walang Area sangit ie 27-30 degrees Celsius.

Time:

This relates to the time of day, afternoon and evening. Sangit walang afternoon time used to spawn. Besides the comparison phase of growth and development of plants also affects when walang rice pest will attack that primarily affects the young phase, whereas in the old phase (generative old age) walang rice pest attack and chose not to move to another host.

Habitat:

Habitats where land affects the growth and development of highly among others layout walang rice fields close to Perhutani, high sugar population and agricultural cultivation systems (planting synchronously).
Thank you for reading this article. Written and posted by Bambang Sunarno. sunarnobambang86@gmail.com
author:
http://schema.org/Personal.
https://plus.google.com/105319704331231770941.
name: Bambang Sunarno.
http://primadonablog.blogspot.com/2015/05/you-know-walang-sangit.html
DatePublished: May 28, 2015 at 10:47