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I found this info and thought you might find it useful. I am seeking and destroying all of this noxious weed I find with my bare hands. Fight the good fight! Never give up!
Weaknesses are to be exploited. Puncturevine doesn't compete well with other vegetation. I have minimized the growth of this plant by merely encouraging natural vegetation to cover the open areas and reduce the potential for growth. A healthy lawn will choke out puncturevine in a short time. Contrary to popular belief, over watering puncturevine will not kill it. In fact it will very likely make it grow like crazy. I think this comes from the fact that wet areas are seldom devoid of vegetation and that by itself will discourage Puncturevines from growing. Watering dry areas and encouraging the seed to sprout is a good idea as long as you go spray within one to two weeks. The same goes after a rain.
Puncturevine Weevils are a natural predator to Puncturevines. They are host specific, which means they eat Puncturevines and only Puncturevines. The adult female seed weevil deposits an egg in a small hole she chews in the green seed. Then she seals it with fecal material. The egg hatches and burrows its way inside the green seed. In the process eating the viable portion of the seed, so it can not sprout a new plant. The weevil larvae will spend its entire larval stage inside the seed. It actually pupates within the seed and emerges from the seed as an adult. The stem weevil works in the same manner only attacking the stem of the plant. Stem Weevils will inhibit the plant's ability to grow and spread. Unfortunately, Puncturevine Weevils aren't perfect. They won't find every single seed. The thing to keep in mind is every seed a weevil eats is a seed that can't sprout. Each adult female weevil will lay 250 - 450 eggs. Eggs will reach reproductive adult age in about 25 days. This is dependent upon accumulated heat units. As weevil numbers continue to build, they will become more and more effective. Cold winters will inhibit survivability. Regions with moderate winters are most conducive to over wintering.
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Posted:Aug 6, 2012
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