Management of the sucking pest complex coconut eriophyid mite, coreid bug and button mealy bug infesting coconut bunches
| dc.contributor.advisor | Faizal, M H | |
| dc.contributor.author | Priya Mohan | |
| dc.contributor.author | KAU | |
| dc.date.accessioned | 2019-05-24T09:41:12Z | |
| dc.date.available | 2019-05-24T09:41:12Z | |
| dc.date.issued | 2001 | |
| dc.description | PG | en_US |
| dc.description.abstract | A study was conducted at the College of Agriculture, Vellayani from April 2000 to July 2001 to investigate the nature and extent of damage caused by the sucking pest complex, coconut eriophyid mite (CEM), coconut coreid bug (CCB) and coconut button mealy bugs (CB M) infesting coconut bunches and to devise suitable chemical and biological management measures against them. CEM, CCB and CBM attack coconut bunches singly or in combinations, the combined attack of CEM and CCB being the most predominant. The coconut palms suffered heavy loss due to the combined infestation of" these pests by way of premature nut fall , varying degrees of damage in retained nuts, distortion and stunting of nuts and formation of barren nuts. An annual premature nutfall of 101.5 nuts palm" was observed due to sucking pest infestation, the share of nut fall due to CEM, CCB and the combined infestation of CEM and CCB being 35.96 per cent, 36.45 per cent and 27.59 per cent respectively. Maximum nutfall was observed in November. 5.81 nuts bunch" palm" were rendered barren or stunted due to infestation of button mealy bugs, singly or in combination with other pests. The infestation of CEM in retained nuts was more or less uniform all through the year whereas CCB showed wide fluctuation with maximum infestation in bunches that opened in November. A new scoring technique was developed, based on surface damage by the pests to assess the loss incurred due to combined infestation of CCB and CEM. Significant negative correlation was observed between surface damage and nut characteristics like weight of whole nut, weight of dehusked nut, weight of dewatered nut, volume of nut water and weight of copra. Significant reduction in the above nut characters was observed in higher scores with high intensity of surface damage as compared to healthy nuts (Score 1). Reduction in weight of whole nut, dehuskednut and copra ranged between 17 to 46 per cent, 13 to 50 per cent and 11 to 53 per cent respectively. Among the various pesticides evaluated against the sucking pest complex, neem oil - garlic emulsion (2 %), quinalphos (0.05 %) + wettable sulphur (0.4 %), endosulfan (0.1 %) + wettable sulphur (0.4 %) and endosulfan (0.1 %) + neem oil garlic emulsion (2 %) were found to be effective in reducing the yield loss. Verticillium suchlasporium (Goddard) and Metarhizium anisopliae (Metch.) Sorok. were found to be infective to CEM and CCB respectively . . Four entomopathogenic fungi Penicillium purpurogenum Stoll., Acremonium strictum Gams., Fusarium solani (Martius) Sacc. and Paecilomyces varioti (Bainer) were identified causing natural mortality CEM population and one fungus, Fusarium moniliforme Wollenw and Reink, to CBM. Two egg parasitoids viz., Chrysochalcissa oviceps Boucek and Gryon homeoceri (Nixon), hitherto unknown to parasitise the eggs of CCB were identified. | en_US |
| dc.identifier.citation | 171753 | en_US |
| dc.identifier.uri | http://krishikosh.egranth.ac.in/handle/1/5810104459 | |
| dc.keywords | Agricultural entomology, coconut bunches pests, trap crop | en_US |
| dc.language.iso | en | en_US |
| dc.publisher | Department of Agricultural Entomology, College of Agriculture, Vellayani | en_US |
| dc.sub | Agricultural Entomology | en_US |
| dc.subject | null | en_US |
| dc.theme | Management coconut pests | en_US |
| dc.these.type | M.Sc | en_US |
| dc.title | Management of the sucking pest complex coconut eriophyid mite, coreid bug and button mealy bug infesting coconut bunches | en_US |
| dc.type | Thesis | en_US |