Varietal Preference of Blue Beetle, Leptis papygaea Baly. Infesting Rice

Author: Venkata Srinivasa Chari M., Mule R.S., Jalgaonkar V.N., Sanap P.B., Thorat T.N., Gurav S.S., Rakshit K.P., Lakshana R., Dalvi N.S. and Kota Revanth Reddy

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Abstract

Among the eight varieties of rice tested for their preference for blue beetle, L. pygmaea, variety Phondaghat-1 recorded lowest (1.36 %) average blue beetle infestation, followed by Ratnagiri-2 (2.88 % infestation) and Karjat-6 (3.39 % infestation) which were statistically at par with each other. The increasing trend of blue beetle infestation was noticed in the screened varieties. Jaya recorded highest (16.80) mean per cent infestation by blue beetle followed by Karjat-8 (14.46) and both of these varieties were at par with each other. On the basis of overall mean per cent blue beetle infestation the descending order were Jaya > Karjat-8 > Karjat-10 > Suvarna > Palghar-1 > Karjat-6 > Ratnagiri-2 > Phondaghat-1. Variety Phondaghat-1 (mean % infestation of 1.36) was categorized as resistant (R). Varieties Karjat-6 (3.39 %) and Ratnagiri-2 (2.88 %) were categorized as moderately resistant (MR). Variety Palghar-1 (7.57 %) was categorized as moderately susceptible (MS). Variety Suvarna (11.59 %) was categorized as susceptible (S) variety. Remaining varieties Karjat-10 (13.17 %), Karjat-8 (14.46 %) and Jaya (16.80 %) reported higher infestation of blue beetle and were thus categorized as highly susceptible (HS) varieties

Keywords

Varietal preference, Leptispa pygmaea, rice

Conclusion

The studies on varietal preference of blue beetle, Leptispa pygmaea for different varieties of rice viz., Karjat-6, Karjat-8, Karjat-10, Phondaghat-1, Palghar-1, Ratnagiri-2, Suvarna and Jaya revealed that none of the rice varieties were found free from the attack of the pest. The overall mean per cent infestation of blue beetle on different rice varieties during the season showed significant differences among them (Table 1). The differences observed in the pre cent infestation by blue beetle might be due to the differences in host food i.e., different rice varieties having different nutritional constituents in them. It may also be due to various morphological characters of the variety (leaf length, leaf width, leaf area, leaf trichome density and leaf colour) and biochemical constituents in the variety viz., sugars, phenols, chlorophyll, silica etc. affecting the fecundity, growth and development of pest and damage caused by it. The present findings are more or less in agreement with the below given eminent scientists. Shah and Patel (1980) reported that the blue beetle a potential weed pest in South Gujarat, causes extensive damage to rice. Screening tests conducted with 170 cultivars of rice showed that none of the varieties tested were found resistant to the pest. Studies conducted by Nadarajan and Skaria (1993) also showed that varieties Ptb.4, Ptb.10, Ptb.28, Ptd.36, H4 and GEB 24 were found resistant to blue beetle, L. pygmaea. Whereas, other varieties such as Ptb.2, Ptb.5, Ptb.8, Ptb.9, Ptb.15, Ptb.18, Ptb.20, Ptb.21, Ptb.22, Ptb.26, Ptb.29, Ptb.30, Ptb.31, Ptb.32, Ptb.33, Ptb.35, Ptb.38, Ptb.40, Ptb.42, Ptb.53, and KAU cultures such as 25331,25333,25336, 25337, 25315, 25316, IR 20 and Co-25 were moderately resistant to the pest. Karthikeyan and Jacob (2007) screened 150 varieties of rice against L. pygmaea and recorded that Ptb.1 (Eravanpandy), Ptb.4 (Vellari), PTB.7 (Parambuvatta), Ptb. 9 (Thavalakannan), Ptb.18 (Eravanpandy), ptb.19 (Anthikkiraya), Ptb.20 (Vadakkanchitteni), Ptb.25 (Thonnooran), ptb.26 (Chenkayamma) and a short duration high yielding variety of Mannuthy (Hraswa) were moderately resistant and 5 varieties/entries viz., MO 12, IET 17895 (UTR -57), Ptb.39 (Jyoti), Ptb.41 (Bharathy) and Varna were found highly susceptible against blue beetle, L. pygmaea. Patel (2008) recorded minimum per cent damaged leaves due to L. pygmaea (0.17) in varieties IR-22 and GR-104 coincided with scale 1, followed by GR-102 (0.19), GR-103 (0.21), Ratna (0.33), GR-7 (0.36), GR-12 (0.40), IR-28 (0.45), GR-10 (0.67), GR-101 (0.68), Narmada (0.72), Masuri (1.29), Jaya (1.37), Gurjari (1.49), IR-66 (1.91) and GR-11 (2.25). Francies et al. (2013) found that the varieties Swarna Prabha, Kanchana and Samyukta were moderately susceptible (MS), whereas, varieties Jaya and Jyothi were susceptible (S) to the infestation of blue beetle, L. pygmaea. Patel et al. (2015) reported that out of eighteen varieties tested, IR-22, GR-102, GR-103 and GR-104 with scale-1 were considered as resistant, whereas, IR-28, GR-6, GR-7, Ratna and GR-12 with scale-3 were identified as moderately resistant to L. pygmaea. Kakde and Patel (2018) observed that seven varieties viz., GAR-1, GR-102, IR-22, GAR-2, GR-103, GNR-2 and GR-104 were considered as resistant (R). However, varieties, Masuri and Gurjari were considered as susceptible (S), whereas, variety Jaya was considered as highly susceptible (HS) to blue beetle, L. pygmaea. Further, Dalvi (2020) revealed that the per cent infestation of the blue beetle, L. pygmaea in different varieties was in the range of 7.21 to 17.14. She further concluded that the highest (17.14) per cent infestation of L. pygmaea was recorded in Jaya and lowest per cent infestation of 7.21 was recorded in variety Karjat-3

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How to cite this article

Venkata Srinivasa Chari M., Mule R.S., Jalgaonkar V.N., Sanap P.B., Thorat T.N., Gurav S.S., Rakshit K.P., Lakshana R., Dalvi N.S. and Kota Revanth Reddy (2024). Varietal Preference of Blue Beetle, Leptis papygaea Baly. Infesting Rice. Biological Forum – An International Journal, 16(1): 333-336