From Table 2 it is clear that the highest (34.37) genotypic coefficient of variance recorded for lint mass per boll
while the highest (40.34) phenotypic coefficient of variance for the monopodial branches per plant.
With respect to boll
weight, greater genetic variances were displayed by less than half of the progenies as compared to their corresponding environmental variances.
The spatial and temporal distribution of reproductive structures [cotton squares of large (68mm diameter), medium (3-6mm diameter), and small bolls
size (5-8mm diameter)] fallen on the soil damaged by boll
weevil between cotton rows were determined in a randomized block design with a factorial arrangement of 4x3, represented by soil surface tracks located at 1-11cm, 12-22cm, 23-33cm, and 34-44cm away from planting row on cotton plants at 70, 85, and 100 days of age.
The significant impact of farm yard manure levels on boll
weight was seen with respect to different tillage technologies.
But extreme heat in late sown plots also results in photosystem inhibition (Schrader et al., 2004), low biomass accumulation (Reddy et al., 1995) and male sterility which cause more flower and boll
shedding (Fisher, 1975).
Pneumatic harvesters removed cotton fiber from the bolls
with suction or a blast of air.
After maturity, all the F1 bolls
along with selfed seed of parents were harvested to complete the experimental seed material for replicated trial of F2s in kharif 2008.
Appearance of various phenophases in different cotton cultivars under CLCuD incidence in different sowing environments 50% square formation 50 % flowering Treatment Healthy Diseased Healthy Diseased SP 7007 10th May 46 41 70 64 25th May 44 40 67 63 9th Jun 42 39 65 62 Pancham 541 10th May 50 44 75 68 25th May 45 41 70 65 9th Jun 44 40 68 64 RCH 791 10th May 44 43 69 66 25th May 42 41 67 65 9th Jun 40 38 65 64 50% boll
formation 50% boll
opening Treatment Healthy Diseased Healthy Diseased SP 7007 10th May 97 90 133 128 25th May 94 86 130 125 9th Jun 91 85 128 124 Pancham 541 10th May 102 91 136 130 25th May 98 86 134 129 9th Jun 94 86 131 125 RCH 791 10th May 95 89 131 129 25th May 93 88 129 128 9th Jun 92 86 128 127 Table 2.
The great genetic variability and phenotypic plasticity of the boll
weevil makes it able to adapt to a wide variety of environmental conditions, allowing the expansion of its geographical distribution beyond its center of origin (Central America) (Showler, 2009).
great Father of Waters, I grew up, beside the prickly boll
(2005) conducted an experiment regarding the effect of sowing dates on the population of boll
weevils, they concluded that squares damage of boll
weevils were 44-56% more abundant in later planted treatments than in the earlier planted treatments.
At its annual Ag Issues Forum, Bayer CropScience (BCS) presented Bryan Boll
with the 2014 Young Farmer Sustainability Award.