Studies on different formulations of the bioagent Trichoderma in the management of stem bleeding disease in coconut

Stem bleeding disease is the most common and well-known disease of coconut and is prevalent in almost all coconut growing countries. Thielaviopsis paradoxa is the pathogen causing stem bleeding disease. The symptoms of the affected trunk areas exhibit dark discolouration and a reddish-brown or rust-coloured liquid bleeding from different points. Affected plants die within 3 to 4 months after stem symptoms first appeared, if corrective measures are not taken properly. Keeping in view the severity of disease and the need for managing the disease with effective biocontrol formulation, the current experiment was initiated during 2014 at Mukkamala village of East Godavari district of Andhra Pradesh State, India. The treatments like Trichoderma harzianum cake formulation, Trichoderma reesei paste formulation along with paste application of copper oxychloride were tested in the field conditions. Among the treatments tested, application of T. harzianum cake formulation completely brought down the disease index from 12.91 to 0 per cent within 50 days of cake application. Disease index of 17.70 was reduced to 2.05 in case of paste application of copper oxychloride, and disease index of 14.02 was reduced to 3.69 in case of paste application of T. reesei against stem bleeding disease of coconut over three years from 2015-2018. Thus, the cake formulation of Trichoderma was found very effective in managing the disease at the field level, which is a bioagent and safer for environment protection

Management of rhinoceros beetle (Oryctes rhinoceros L.) by biological suppression with Oryctes baculovirus in Andhra Pradesh

The large scale demonstrations on efficacy of Oryctes baculovirus in managing coconut rhinoceros beetle, Oryctes rhinoceros was carried out in 50 acres each at Borivanka, Kuttuma and Bhiripuram, villages in Srikakulam district and Nagullanka and Atreyapuram villages in East Godavari district of coastal Andhra Pradesh. The release of the virus infected beetles was initiated in April 2012 and continued up to June 2013 and the leaf and spindle damage were recorded at three months interval up to twelve months. Before the release of baculovirus infected beetles, per cent of leaf damage due to beetles ranged from 12.5 to 35.5 and spindle damage ranged from 33.3 per cent to 45 per cent. After one year of release of baculovirus infected beetles, leaf damage decreased and ranged from 6.8 to 18.5 per cent and the spindle damage also reduced and ranged from 7.5 to 13 per cent in the mass demonstration villages. In plantations of coconut where application of insecticides is hazardous, biological control with baculovirus infected beetles holds importance

Performance of coconut hybrids and varieties in the East coast of Andhra Pradesh

Coconut (Cocos nucifera L.) is one of the plantation crops with more life span, so suitability of a variety or hybrid for particular region may improve the productivity of the coconut. An experiment was carried out with seven hybrids and two varieties viz. Chandra Sankara (COD × WCT), Chandra Laksha (LCT x COD), VHC1 (ECT × MGD), VHC-2 (ECT × MYD), Kera Ganga (WCT × GBGD), Laksha Ganga (LCT × GBGD), Godavari Ganga (ECT x GBGD), Kera Chandra (Double Century) and Chandra Kalpa at Dr.YSRHUHorticultural Research Station, Ambajipeta, Dr. B. R. Ambedkar Konaseema Dist., Andhra Pradesh. The experiment was initiated in 2002, in Randomized Block Design in three replicated blocks. The compiled data for six years (2015- 2021) revealed that, Godavari Ganga recorded significantly highest nut yield /palm/year (144.40 nuts) followed by VHC-2 (134.93 nuts) and Kera Ganga (133.33 nuts). Godavari Ganga recorded maximum copra yield of 3.20 t/ha and oil yield of 2.20 t/ha. Tender nut water quantity was recorded more (322.5 mL) in VHC-2 and Godavari Ganga. Due to its superior nut, copra and oil yield, Godavari Ganga and VHC-2 can be recommended for cultivation Andhra Pradesh

Management of coconut slug caterpillar (Macroplectra nararia) with light traps

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Effect of Foliar Application of Plant Growth Hormones on Yield and Quality Parameters in Ajowan (Trachyspermum ammi L. Sprague)

Foliar application of plant growth regulators viz.,  GA3 -50& 100 ppm,  NAA- 50 ppm &100 ppm, Thiourea- 250 & 500 ppm, 28-Homobrassinolide- 0.1& 0.2ppm, Triacontanol - 2.5& 5 ppm and Control. All the treatments were applied as foliar sprays at 30 and 45 DAT. Days to 50% flowering (46 d) and days to harvest (100.20 d) were found earlier in ajowan with the foliar applications of triacontanol by 5 ppm (T10).The same treatment had recorded the maximum number of umbellate umbel-1(14.20). Foliar applications of thiourea by 250 ppm (T5) had record the highest values  with respect to yield, yield attributing characters viz number of umbels plant-1(228.70), number of seeds umbel-1(183.60), number of seeds umbellate-1(13.50), test weight (1.56 g), seed yield plant-1 (28.50 g), seed yield plot-1 (1425 g), seed yield hectare-1(1583.33 kg), harvest index (69.71%) and quality parameters viz essential oil (3.64%) and protein contents (19.26 mg 100 g-1)

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Not AvailableAn experiment was conducted at Horticultural Research Station, Ambajipeta during 2006-2011 to identify the most suitable intercrop among medicinal and aromatics under coconut. The trial was laid out in June, 2006 with four aromatic crops and one medicinal crop in randomized block design with four replications. The results revealed that the yield of all the medicinal and aromatic plants grown as intercrop were found to be reduced compared to their sole crop yields. The reduction in yield was less in lemon grass (4.5%) followed by citronella (9.3%), palmarosa (10.3%), patchouli (14.7 %) and mango ginger (14.9%). The nut yield of coconut increased with intercropping of medicinal and aromatic plants. Coconut+patchouli intercropping system recorded 55.3% increase in nut yield/palm followed by coconut+palmarosa (43.5%) when compared to monocrop yield. The economic analysis of the cropping system revealed that the highest net returns were recorded in crop combination coconut + patchouli (Rs. 1,43,705/-) with benefit – cost ratio of 2.84 followed by coconut + citronella (Rs.1,08,870/-) with benefit – cost ratio of 2.12 compared to the net returns of Rs. 29,650/- with benefit - cost ratio of 1.60 in monocropping of coconut. Hence, cultivation of patchouli followed by citronella as intercrops in coconut can be recommended to the farmers of Coastal Andhra Pradesh in general and to the East Godavari area in particular.Not Availabl

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