Crop Protection

Tamil Nadu Agricultural University > Regional Research Station - Paiyur > Crop Protection

Crop Protection

Crop protection

  • Low population of mites (10.0 to 1 .5 mites/leaf) up to 80 days after transplanting in kharif crop was noticed in paddy cv. PS3, Kavuni, manavai, Kettanur, Vellaikottai, MDU 3, Vellaikudainchan, ps 2, K429 and Vellaikudouvazhai. The highest population of mites and their damage was noticed in paddy cv. Paiyur 1(21.0 mites/leaf) with the onset of north east monsoon (9.5 mites/leaf).
  • Seed treatment of finger millet  with  Pseudomonas fluorescens @ 10 g/kg and Trichoderma viride @ 4 g/kg of seed followed by foliar application of trocyclozole+mancozeb @ 2 g/lit at maximum tillering and heading phase was effective in controlling both leaf and neck blast and also recorded  the  highest grain yield with higher  Cost Benefit Ratio
  • Field bean,Less than 10  per cent damage by bruchids was recorded with Denkannikottai local and  COLL-05-11. Two advanced entries viz., DPI/PYR 03-007 & COLL 05-29 showed increasing level of resistance to pod complex both in field and laboratory conditions
  • Flubendamide was found to be the promising chemical for the field bean pod borer & no residues were detected at test concentration in the produce.
  • The role of Pollinators in the rainfed field bean exposed the activity of three species viz., Xylocopa, viz., X. latipes, X. amthystina and an unidentified species of Xylocopa (Small). Of these, X. latipes was the most frequent visitor, constituting more than 66 per cent of all visits to flowers The foraging activity was observed in both the session of the day but highest between 10.00h and 14.00h. A forager spent an average of 7-8 seconds per flower other pests like aphids were also observed.
  • Field bean intercropped with finger millet Paiyur 2 recorded the least pod borer complex damage of 9.93 percent damage when compared to 54.8 per cent damage in control which is significant.
  • Yellow sticky board trap attracted more of white flies, while white sticky board trap to aphids & fairose trap to thrips.  Drongo daily activity (4-6/day) was observed in bird perches of Biological control plots
  • Out of 350 Horse gram accessions, tested under laboratory condition, 176 accessions reported per cent loss of 0.0-3.0 % followed by 3.1-6.0 per cent loss in 93 accessions and highest per cent loss of 15.46 % in 10 accessions
  • The mango nut weevil grub population was higher in Bangalora during the month of April and May and at the same time as the season progresses during the month of June; the grub population was higher in Neelum.
  • IPM includes Raking of soil followed by the application of neem cake @ 2 kg /tree. Spray of Neemazal 1% 2 ml /litre at peanut size, Spray of Acephate @ 1.5 g/litre at lime stage and spray of spinosad @ 0.5 g /litre at 15 days interval reduced the nut weevil incidence in mango.
  • For the management of Root rot and wilt in Brinjal, Seed treatment with Pseudomonas fluorescens PF1(TNAU formulation) @ 10 g/kg +soil drenching with copper hydroxide @ 0.2% at 30 and 60 days after planting recorded 1.22 and 0.96 % incidence of root rot and fungal wilt, respectively as compared to 21.13 and 18.05 % of root rot and fungal wilt, respectively in control.
  • To control blast in finger millet,Seed treatment with Pseudomonas fluorescens Pf1 (TNAU formulation) @ 10g/kg of seed along with two rounds of spray @ 10 g/l had reduced the leaf blast, neck blast and finger blast disease incidence.
  • Foliar spray of hexaconazole + zineb (0.2%) at 30 and 45 DAP was effective against Alternaria leaf spot and Botrytis flower blight in marigold.
  • The bioagents Trichoderma harzianum, Pseudomonas fluorescens and T. viride were effective in inhibiting the mycelial growth of Alternaria solani in tomato
  • Seed treatment (ST) with Pf1 @ 10 g/kg + soil drenching  with copper hydroxide (0.2%) at 30 and 60 DAP was effective in controlling root rot, fungal and bacterial wilt diseases in brinjal and thereby enhanced the unit productivity of  fruits
  • Application of Pseudomonas flouresens (Pf) @ 10 g / kg seed rhizome + soil application of Pf @ 2.5 Kg/ha along with 50 kg of FYM + foliar application of liquid formulation of P.f @ 2 lit/ha at three months interval  suppress the root knot nematode infection in turmeric
  • Dipping of mother bulbs in carbosulfan 1000 PPM and application of Pf @ 2.5 Kg / ha mixed with 50 Kg of FYM every third month effectively check nematode disease complex in tube rose
  • Root dip of tomato seedlings in P. lilacinus and application of T.viride (2 kg/ha) with Marigold intercrop registered decreased nematode population in soil (80.7%) and root (82.6%)
  • Soil application of Pf1(2.5kg/ha) + P. lilacinus (2.0kg/ha)  at the time of planting decreased nematode population  in soil (85.73%) and root (88.55%)  and decreased wilt incidence percent up to 18.42  in brinjal.