Informatics Publishing Limited

Dinesh L. Patil ¹, K. A. Patel ², N. R. Toke ¹, Archana T. Ambule ¹

Affiliations
1 Department of Entomology,n.m. College of Agriculture, Navsari Agricultural University, Navsari (gujarat), IN
2 Main Sorghum Research Station (n.a.u.), Surat (gujarat), IN

Abstract

Biology of Tetranychus urticae Koch was studied under laboratory at 27.79 ± 4.40°C temperature and 79 ± 5.75 per cent RH during Sept. 2008. The finding showed that life cycle of T. urticae consisted of five stages viz., eggs, larva, protonymph, deutonymph and adult and one short inactive stage called quiescent stage. The eggs incubation period of T. urticae was 3.29±0.62 days. The larval body measured 0.14±0.01 mm in length and 0.10±0.01 mm in width and lived for 1.79±0.64 days in male and 2.71±0.57 days in female. The mature larva entered in a quiescent stage (nymphochrysalis). The total developmental period was longer in female (10.61±1.21 days) as compared to male (8.44±1.75 days). Mated female lived for longer time and laid higher number of eggs than unmated female. Mated female produced progeny consisting of both sexes, whereas, unmated female invariably gave rise to male progeny.

Keywords

Tetranychus Urticae, Biology, Carnation

Full Text

     

Archana T. Ambule ¹, V. S. Desai ¹, D. L. Patil ², N. R. Toke ²

Affiliations
1 Department of Agriculture Entomology, College of Agriculture, Dr. Balasaheb Sawant Konkan Krishi Vidyapeeth, Dapoli, Ratnagiri (M.S.), IN
2 Department of Agriculture Entomology, Navsari Agricultural University, Navsari (gujarat), IN

Abstract

An experiment was conducted to study the feeding potential of Cryptolaemus montrouzieri Mulsant on different species of mealybugs at Department of Agricultural Entomology, College of Agriculture, Dapoli. The feeding potential of C. montrouzieri on grubs and adults of mealy bugs jointly revealed that the total consumption of grub was much higher on M. hirsutus i.e. 144.4±15.64 with their longevity of 12.10±2.1 days than Phenacoccus solani and custard apple mealy bugs. Similar pattern of consumption was found in case of adults, where the female predator consumed more i.e. 443.90±27.13 with longevity of 27.45±1.08 days. The overall findings of the feeding potential showed that the Australian ladybird beetle nymphs and adults consumed more number of preys of M. hirsutus than other two species.

Keywords

Cryptolaemus Montrouzieri, Mealybug, Feeding Potential

Full Text

     

Dinesh L. Patil ¹, K. A. Patel ², N. R. Toke ¹, Archana T. Ambule ¹

Affiliations
1 Department of Entomology,n.m. College of Agriculture, Navsari Agricultural University, Navsari (Gujarat), IN
2 Main Sorghum Research Station, Navsari Agricultural University, Surat (Gujarat), IN

Abstract

The acaricides tested for the bio-efficacy against Tetranchyus urticae under polyhouse conditions revealed that all the acaricidal treatments were significantly superior to untreated control in checking the mite population under polyhouse conditions. Among acaricides, propargite 0.05 per cent gave 69.19 per cent mite population reduction after two application. The next best treatment in order of effectiveness was abamectin 0.0025 per cent (63.34%) and it also exhibited consistent performance as second best treatment, followed by dimethoate 0.03 per cent (57.97%). However, the benefit cost ratio showed that propargite and dimethoate were most economical with net BCR of 1: 8.98 and 1: 8.93, respectively and gave effective control of T. urticae.

Keywords

Tetranychus Urticae, Carnation, Acaricides

Full Text

     

Archana T. Ambule ¹, G. G. Radadia ¹, D. L. Patil ¹, N. R. Toke ¹

Affiliations
1 Department of Agricultural Entomology, N.M.College of Agriculture, Navsari Agricultural University,NAVASRI (GUJARAT), IN

Abstract

The study on relation of morphological characters to fruit infestation of H. armigera was conducted in College Farm, N.M.C.A, Navsari Agricultural University, Navsari, Gujarat during two consecutive years 2012-13 and 2013-14. The result showed that the correlation of plant height (r= 0.7775), branches plant^-1 (r= 0.7874), and fruits plant^-1 (r= 0.7388) with infestation of H. armigera were significantly positive, while the effect of fruit pericarp thickness (r= - 0.9576) exhibited significantly negative association with the damage of tomato fruit borer. However the stem diameter, fruit diameter, locules fruit^-1 and calyx fruit^-1 showed positive but non-significant association with fruit infestation recorded 0.4855, 0.3048, 0.3413 and 0.3943 correlation values, respectively.

Keywords

Morphological Characters, Tomato Fruit Borer, Helicoverpa armigera (Hubner).

Full Text

     

Archana T. Ambule ¹, G. G. Radadia ¹, C. U. Shinde ¹, Dinesh L. Patil ¹

Affiliations
1 Department of Entomology, N.M. College of Agriculture, Navsari Agricultural University, Navsari (Gujarat), IN

Abstract

Field experiment conducted on relative efficacy of nine different insecticides against H. armigera (Hubner) in tomato during year 2012-13 revealed that all the nine insecticides were significantly superior to untreated control in reducing H. armigera infestation. However, flubendiamide 0.004 per cent recorded minimum larval population (0.43 larva/plant) and 10.09 per cent fruit damage on weight basis than the remaining treatments which was identical with chlorantraniliprole 0.0055 per cent (0.58 larva/plant and 10.62 % fruit damage) and spinosad 0.0068 per cent (0.68 larva/plant and 11.34 % fruit damage). Higher marketable yield recorded from treatments of flubendiamide 0.004 per cent chlorantraniliprole 0.0055 per cent and spinosad 0.0068 per cent with 25.21, 24.84 and 22.20 tonnes/ha, respectively.

Keywords

Relative Efficacy, Helicoverpa armigera (Hubner), Tomato.

Full Text