Browsing by Author "Jacob, S.A."
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Item Biology and bionomics of ginger and turmeric scale Aspidiotus hartii Green(2007-02-08) Jacob, S.A.A brief description of morphology and biology of Aspidiotus hartii, an important pest of turmeric in the field and under storage is given. Due to the infestation by the scale, plants look pale and ultimately dry up. Two hymenopteran parasites Physcus sp. and Adelencyrtus moderatus were found to attack A. hartii.Item Biology of Dichocrocis punctiferalis Guen. on turmeric(2007-02-08) Jacob, S.A.Dichocrocis punctiferalis Guen. is a polyphagous pest with twenty two species of alternate host plants. Moths have punctilious requirements for egg laying in captivity and it was found that an ambient temperature of 22°C-31°C and relative humidity in the range of 50-90% were favourable for oviposition. Out of the five larval instars, 4th and 5th were voracious feeders. The life cycle was completed in 33-52 days under laboratory conditions. Seven saprophytic dipteran flies were found associated with the shoot borer. Among the predators and parasites, the dermapteran Euborellia stali (Dohrn.) and the mermithid nematode have some significant role in controlling the shoot borer population in the field.Item Distribution of the spindile bug of arecanut Carvalhoia arecae miller and China in Kerala, its bio-ecology,suspected role as a vector of yellow leaf disease and control(Central Plantation Crops Research Institute,Pacha(p.o),Palode,Trivandrum, 1989) Jacob, S.A.Item Nature and Extent of Damage Caused by Spindle Bug of Arecanut, Carvalhoia Arecae Miller and China(2007-02) Jacob, S.A.; Das, N.M.; Kuriachen, P.I.The feeding suppressed the emergence of spindle leaf partly or fully depending on the period of occurrence of damage. Total suppression of spindle leaf emergence even choked further growth of the palm. Injury caused by oviposition was observed in detail for the first time. Characteristic "Pox marks" made on the rachis of the leaf and internal damage also were noted in detail for the first time. Histological observations of the leaf along the feeding marks showed that the bug resorted to lacerate and flush" feeding. Formation of water soaked areas soon after stylet insertion, continuance of plasmolysis after the removal of the insect from the feeding spot and later discolouration and collapse of cells indicated that the action of the saliva would have caused the injury. The bug affected the growth and vigour of transplanted seedlings. About 26 to 30% of the unprotected young palms up to the age of 5 years were seen withered and dead due to the infestation.Item Pests(2007-02) Dhileepan, K.; Jacob, S.A.Item Pests of ginger and turmeric and their control(2007-02) Jacob, S.A.Item A Prototype Spray Lance for Tall Arecanut Palms(1984) Jacob, S.A.; Mani, U.; Babu Cherian MathaiItem Sesamia inferens Walker - A New Pest of Oil Palm Seedlings in India(1995) Jacob, S.A.; Kochu Babu, M.