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KrishiSewa - Agriculture Knowledge for Indian Farmers

Leaf webworm Tag

31 Jul

Posted at 07:51h in Crop disease
Saravanan* and T. Phanikumar Senior Scientist (Agrl. Entomology) 7 views

तेल ताड़ के बगीचों में लीफ वेबवर्म, एक्रिया मायरिकी (लेपिडोप्टेरा: डिप्रेसारिडे) के लिए जैव नियंत्रण एजेंट Oil palm, Elaeis guineensis Jacq.(Family: Arecaceae) is the richest source of vegetable oil with high yield levels of more than 5 tonnes of oil per ha per annum compared to other oil seeds crops that give less than 1 ton.  The productivity of the crop is often challenged by water stress, drought, biotic stresses like pests and diseases and constraints related with nutrient management. Since irrigation is given at regular intervals, the micro climate with high humidity is created, which makes congenial conditions for pests and diseases development. It is reported that the oil palms in India are being attacked by a number of insect pests.  In recent years, leaf webworm, Acria meyricki Shashank and Ramamurthy (Lepidoptera: Depressariidae) (Figure 1) is emerging as serious defoliator in many of the oil palm gardens of West Godavari, Krishna and East Godavari districts of Andhra Pradesh, India. However, the infestation is not uniform in those districts which ranged from low to severe form (Figure 2).A yield loss of up to 34 % is reported due to infestation of leaf web worm. The perennial nature of palms and monocropping system as practiced in many locations provide ample opportunities for the build-up of this...

24 Apr

Posted at 05:52h in Crop disease
Dr. L. Saravanan, 12 views

तेल ताड़ का पत्ता वेबवॉर्म, एक उभरता हुआ गंभीर कीट और तेल ताड़ के बागानों में इसका प्रबंधन Oil palm (ElaeisguineensisJacquin: Arecaceae) is known to be the highest edible oil yielding perennial crop, capable of yielding 4-5 MT of palm oil and 0.4-0.5 MT palm kernel oil with good planting material, irrigation and proper management. However, the productivity is not achieved due to infestation by a wide range of fauna which include insects, birds, mites and mammals, apart from diseases, nutrient deficiencies, water stress etc. As the oil palms grow and attain tallness, the leaves of adjacent palms are overlapped, thereby preventing sunlight penetration in the plantations, a more favourable environment is created for the pests to proliferate and cause severe outbreaks in oil palm. There are at least 80 species of arthropods are associated with oil palm and many are potential pests and some are serious and inflicting heavy damage on oil palms in India. Recently, a new species, Acriameyricki (Lepidoptera: Depressariidae) (Shashank and Ramamurthy) is described and reported from Andhra Pradesh, India infesting on oil palm for the first time. The pest is often referred as oil palm leaf webworm, because, the caterpillars spin a protective white silk web sheltering them while eroding the leaflets. It was first noticed during the winter months...