Thumbnail Image

Anand Agricultural University, Anand

Anand Agricultural University (AAU) was established in 2004 at Anand with the support of the Government of Gujarat, Act No.(Guj 5 of 2004) dated April 29, 2004. Caved out of the erstwhile Gujarat Agricultural University (GAU), the dream institution of Sardar Vallabhbhai Patel and Dr. K. M. Munshi, the AAU was set up to provide support to the farming community in three facets namely education, research and extension activities in Agriculture, Horticulture Engineering, product Processing and Home Science. At present there seven Colleges, seventeen Research Centers and six Extension Education Institute working in nine districts of Gujarat namely Ahmedabad, Anand, Dahod, Kheda, Panchmahal, Vadodara, Mahisagar, Botad and Chhotaudepur AAU's activities have expanded to span newer commodity sectors such as soil health card, bio-diesel, medicinal plants apart from the mandatory ones like rice, maize, tobacco, vegetable crops, fruit crops, forage crops, animal breeding, nutrition and dairy products etc. the core of AAU's operating philosophy however, continues to create the partnership between the rural people and committed academic as the basic for sustainable rural development. In pursuing its various programmes AAU's overall mission is to promote sustainable growth and economic independence in rural society. AAU aims to do this through education, research and extension education. Thus, AAU works towards the empowerment of the farmers.

Browse

20052
Reset filters
Subject: Agricultural Entomology × Author: Patel, Yogeshkumar C. × Type: Thesis × Thesis Type: Ph.D ×
Reset filters

Search Results

Now showing 1 - 2 of 2
  • Thumbnail Image
    ThesisItemOpen Access
    IMPACT OF HABITAT MANIPULATION ON NATURAL ENEMIES OF Helicoverpa armigera (HUBNER) (LEPIDOPTERA : NOCTUIDAE) IN TOMATO (Lycopersicon esculentum MILLIERE)
    (AAU, Anand, 2005) Patel, Yogeshkumar C.; YADAV, D. N.
    Investigations were carried out during 2003-04 and 2004-05 to enhance natural biological control of H. armigera in tomato, by manipulating cropping ecology and exploiting the behaviour of the pest. Three habitats viz., African marigold, negro coffee and bidi tobacco were manipulated with tomato. Results revealed that African marigold grown on either sides of five rows of tomato attracted Helicoverpa armigera moths for oviposition and also egg parasitoids Trichogramma chilonis and T. aciiaeae. Both collectively caused a mean parasitisation to the tune of 27.14 per cent during 2003-04 and 35.84 per cent during 2004-05 on African marigold. The resultant population of Trichogramma appeared to have shifted to tomato and caused considerable and consistent parasitisation, which alongwith other natural enemies contributed in reducing of larval population of H. armigera and higher marketable fruit yield. The enhancement of Trichogramma in tomato was also observed when negro coffee was planted on either sides of five rows of tomato. Negro coffee provided an alternate host in the form of Catopsilia pyranthe, a pierid butterfly eggs which were parasitized by T. chilonis and T. achaeae throughout the season which caused a mean per cent parasitisation of 34.31 and 39.50 during 2003-04 and 2004-05, respectively in tomato. Both 7. chilonis and T. achaeae in this habitat manipulation resulted in giving a mean egg parasitisation of 22.66 per cent and 31.67 per cent during 2003-04 and 2004-05, respectively, which was higher than in unmanipulated control, African marigold and bidi tobacco manipulated tomatoes. Consequently there was significantly lesser larval population of H. armigera than both the controls and higher marketable fruit yield. Tomato manipulated with bidi tobacco provided breeding ground for mirid bug, Nesidiocoris tenuis, which is known for its predatory nature besides, being phytophagous. On bidi tobacco, N. tenuis maintained its population throughout the season, which also helped in maintaining its sizable population on tonrrato, a natural host of N. tenuis. The N. tenuis population was significantly higher in tomato than on other manipulations suggesting that the population of bugs shifted from tobacco to tomato. Thus, higher population of N. tenuis on tomato and bidi tobacco resulted into higher predation of H. annigera eggs. Besides, N. tenuis, there were twelve species of natural enemies viz., T. chilonis, T. achaeae, Campoletis chlorideae, Eucarcelia illota, Cotesia sp., Argiope anasuja, Oxiopes wronghtoni, Peucentiasp., Thomisus sp., Rhinocoris fuscipes; Paederus fuscipes and an unidentified tetagonid were noticed during study, which also exerted natural control of the pest and contributed 24.65 per cent and 23.11 per cent higher marketable fruit yield in manipulated system than control block, respectively during 2003-04 and 2004-05. All the three habitats viz., African marigold, negro coffee and bidi tobacco were equally effective in enhancing natural biological control of H. armigera in tomato than control. African marigold and bidi tobacco maintained sizable larval population of H. armigera and were statistically at par. In view of this, periodically plucking of marigold flowers and topping of bidi tobacco at appropriate stage is suggested. Similarly, reported damaging role of mirid bug, N. tenuis to tomato flowers also warrants further study.
  • Thumbnail Image
    ThesisItemOpen Access