Influence of Weather Parameters on the Incidence and Severity of Guava Scab Caused by Pestalotiopsis psidii (Pat.)

Guava (Psidium guajava) is an important tropical fruit crop of India and is known as “apple of the tropics”. It is grown and utilized as an important fruit in tropical countries like India, Indonesia, Pakistan, Bangladesh and South America. Among the biotic and abiotic diseases of guava, guava infected by scab disease [Pestalotiopsis psidii (Pat.) Mordue] is an economically important and reported average yield losses in the range of 12-18%. An experiment was conducted during 2023 at Horticulture garden, Main Agricultural Research Station, University of Agricultural Sciences, Raichur during 2023 to understand the influence of various weather parameters on the guava scab disease development. The results revealed that, irrespective of the varieties, interaction among maximum temperature, minimum temperature, maximum relative humidity, minimum relative humidity, rainy days and rainfall showed significant positive correlation with guava scab disease. And the incidence and severity of guava scab was found to be 23.21, 56.00 (Allahabad Safed), 32.45, 68.50 (Lucknow 49) and 85.00, 74.51 (Arka Kiran) respectively.

Semi Automated Movement Based Screening of Aqueous Extracts of Cinnamon Leaf, Almond, Beetroot Carrot, Ashwagandha and Tulsi on Caenorhabditis Elegans Model System for Health Beneficial Impact

The research was conducted at University of Agricultural Sciences Raichur during 2021-22. In this research Caenorhabditis elegans is utilized by the researchers to know the effects of various extracts, drugs, nano particles, xenobiotics, magnetic effects on behaviour, neuronal effects, feeding pathways, apoptosis, ageing related pathways. Experiments were performed to evaluate the traditional herbs (Cinnamon, Almond, Beetroot Carrot, Ashwagandha and Tulsi) consumption for their health beneficial effects by monitoring the movement as an end point. Movement of an organism is considered as the health and age influencing factor. As the movement is well maintained in organism means health is also well maintained. Hence consistent movement is the factor for the healthy life. In the present study the organism movement has been monitored from L4 onwards every day for 30 minute till 21st day of the survival by automated system. The worm movement during this period has been categorised based on activity in three categories from L4 to 4days the activity ranged from 28.0 units to 10 IR units, 5th to 15th day 27.82 to 14.67 and from 16th to 21st day ranged from 17.87 to 14.44 IR units in non exposed N2 wild type worms. There is a gradual increase in the activity has been recorded on the exposure to health beneficial extracts in a single dose of supplementation. Hence, the study concludes that the health supplements can impact on the move ability of worms and maintains consistent movement till 21 days. Further studies are required to establish comprehensive health beneficial effects of these extracts at organism level.