Ref ID : 7639
Prabhat K. Saxena, Harmohan K. Chhabra, and Sneh Lata; Biology of Helicotylenchus elegans Roman (Rotylenchoidinae: Nematoda). Zool.Anz.,Leipzig 190(1/2):142-148, 1973
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Helicotylenchus elegans completed its life cycle in 26 to 34 days at 25 degrees C and it has five stages including four larval and one adult. The first stage larvae appeared inside the egg in 6 to 8 days after the egg was laid. The first stage larva moulted within the egg and second stage larva emerged in 9 to 12 days and changed into the adult in 17 to 22 days through third and fourth moults. The second, third and fourth larval stages lasted for 8 to 10, 6 to 7 and 3 to 5 days, respectively. The host-range studies revealed that 13 plant species were host out of the 15 plant species tested. Pathogenic studies showed that symptoms on tomato could be seen only when the population level was 1000 and above per 500 g of soil. Further, an increase in the population level, caused a proportionate decrease in the growth of the plant.