Guru GyaanAgroStar Agronomy Centre of Excellence
These Pests Cause Severe Infestation to Paddy Crop at Reproductive Stage
Paddy transplantation has come to an end in most parts of the country, and the panicle stage is about to begin in a few areas. In the event of inadequate care at this point, farmers may face economic losses. Let's analyse the probable pests that attack at this stage and the management of paddy insect pests. • Paddy Stem Borer: Larva feed inside the stem causing the central shoot to dry at the time of the panicle. As a consequence, the emerged panicle turns whitish with no grain filling. Infested shoots can be easily pulled out by the hands. This kind of damage is common in the paddy crop as 'White ear.' • Paddy Leaf Folder: Larva rolls the blade of the leaf by fastening its edges and feeds inside the green material. Transparent patches are seen on the leaves, and when the infestation is higher, the leaves turn white and eventually dry. • Paddy Leaf Hoppers: Hoppers suck the sap from the bottom of the stems. As a repercussion, yellow patches appear, which soon turn brownish and lead to drying. Burning effect seen on the plant is known as the symptoms of hopper burn. Infestation typically begins from the middle of the field and continues to spread in a circular way. Panicles do not emerge or the grain stays absent and the husk stays soft in the infested crops. • Rice Skipper: Larva fastens the edges of the leaf to make rolls and feeds inside. It remains in the fold and cuts off the leaves. • Horn Caterpillar: On the thorn, Larva has two red horns like structures in the head part. It starts to feed from the edges of the leaf and reaches to the middle of the rib. • Blue Beetle: The pest eats the green matter of the leaves. Given the unique feeding habit, white patches are seen parallel to the mid-vein of the leaf. • Rice Ear Head Bug: The pest emits an offensive odour and is therefore also known as the "Gundhy bug." Both nymphs and adults suck the grain sap at the milky stage. Consequently, the grains do not mature and remain empty. • Armyworm: It is also known as "Panicle cutter larva." Larva cuts the panicles that have emerged, which can be seen on the surface of the ground. • Sheath Mites: This pest sucks the sap from the leaves and makes it easier and faster for the fungus (sheath rot) to enter the leaf. As a direct result, not all grains are attached to the panicle and turn brownish. • Crabs: They cut down the plant near the water level. In addition, burrows are also produced on the bund which results in water being drained out of the paddy field. • Rats: They cut the matured panicles and store them in their burrows.
Chemical Management: • Dip the roots of seedling in 0.02% Chlorpyriphos 20 EC + 1% Urea for 4 hrs. prior to transplanting • Apply Quinalphos granules at 1.0 kg ai/ha 10 – 15 days after planting • The newly hatched borer larvae must be flit with 2 rounds of Quinalphos or Phosphomidon at 0.5 kg ai/ha at 7 days interval • Dusting with Malathion IS effective against gundi bug infestation • In case of armyworm infestation, spray the crop in the evening after sun set with Nuvan 0.5 kg a.i/ha Biological Management: • Field release of egg parasitoid Trichogramma japonicum at weekly interval @ 50,000 ha during egg laying stage of rice borer is very effective Release of mired bug Cytorhinus lividipennis @ 50 – 75 egg/ m2 Dr. T. M. Bharpoda, Ex. Professor of Entomology, B. A. College of Agriculture, Anand Agricultural University, Anand- 388 110 (Gujarat India) If you find this information useful, click on the yellow thumbs up sign under the photo and also share this with your farmer friends using the options given below.
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