TITLE:

Effect of nematicide treatments on cotton yield at AG-CARES, Lamesa, TX, 2000.

AUTHORS:

Terry Wheeler, Danny Carmichael, Lionel Felts, Assistant Professor, Research Associate, Aventis CropScience

Planting date:          8 May

Variety:                     Paymaster 2326RR

Replications:            3

Plot size:                   four-rows wide, length ranged from 925 to 1694′

Plant mapping:       20 plants/plot on 11 July

Nematode sampling: 17 July

Location:                  3rd and 4th spans in the conservation tillage (wheat-stubble) area.

Yield data was collected with a MicroTrak yield monitor on a four row stripper.

Treatments:               1 = Orthene 90S applied on 30 May, 3.2 oz/acre

2 = 3.5 lbs/a of Temik 15G applied at planting.

3 = 5 lbs/a of Temik 15G applied at planting.

4 = 5 lbs/a of Temik 15G applied at planting and two applications of Vydate (8.5 oz/acre/application) applied at pinhead size square (16 June) and one week later.

5 = 5 lbs/a of Temik 15G applied at planting + 5 lbs/a side dress at pinhead size square.

6 = 5 lbs/a of Temik 15G applied at planting + 7.5 lbs/a side dress applied at pinhead size square.

7 = 5 lbs/a of Temik 15G applied at planting + 7.5 lbs/a side dress applied at pinhead size square using a rolling cultivator applicator.

RESULTS AND DISCUSSION:

There was no advantage to using Temik 15G in 2000 with respect to any plant mapping characteristics, nematode density or yield.

Treatment	lbs of lint/a	PMa	Height (in.)	Nodes	NAWFb	Squares
1	597	17,520	12.2	11.1	6.3	7.5
2	609	15,500	12.2	10.7	5.7	7.6
3	566	7,400	11.5	10.7	5.9	6.3
4	671	5,960	12.4	10.7	5.9	6.9
5	650	8,120	12.5	10.9	5.6	7.7
6	562	11,680	11.5	10.4	5.8	6.5
7	613	17,490	12.3	10.9	6.0	6.6
aPm is a root-knot nematode/pint of soil at midseason.b NAWF is the nodes above white flower.