The cotton flea is an adult. Photo: Texas AgriLife Extension
The general situation
Last week, May 24, we received 3-5 inches of rainfall across the valley, and McCook farmers unfortunately received significant damage from hail on their arable crops in the area. This week we had a high temperature and a few short rains during the week. Heat units are being built quickly, and overall crops from recent rainfall look good.
Lots of cotton in full bloom with plants from 8 to 5 NAWF, also lots of cotton in square shape. We have seen a significant reduction in the populations of cotton aphids and spider mites since last week’s rains were heavy enough to bring them down.
We still feel the pressure of chili thrips along the river in the Pharr, Donna, La Feria, Bluetown and Los Indios areas. Chili TRIPS causes bronzing of the leaves and can cause severe defoliation if left untreated. Preliminary work on the effectiveness of the Chilean TRIPS in cotton has been carried out by Dr. Holly Davis last year in 2021 demonstrated good control with registered products.
The main pest now in cotton are flea horses. We see large numbers of adults and nymphs causing explosions along the river and in spotted areas in the middle of the valley, as many growers have reported treating fleas this week.
For more information on TRIPS peppers and photos of their damage, please Click here.
An update from Edward Herrera with a Texas weevil
From the year to the present sown areas of cotton: 182 213.2 ac.
To date, the number of weevils in the Lower Rio Grande Valley is 102. This is a 65 percent decrease in the number of weevils over the same period last year. Recent rains have caused the germination of cotton seeds on sown areas that have been presented to the unsuccessful and will not be sent for harvest.
The destruction of this cotton, which is not tolerated for harvesting, is important in the event that the area needs treatment, and these hectares will not add program costs. Recent rainfall has also created problems with access around field perimeters. Overgrowing weeds creates difficult and dangerous conditions when obstacles are overcome. Another very important problem of the program is the destruction of traps.
Please keep in mind that good catch data helps identify any potential for infection and can be eliminated in a timely manner. These data can be very useful to help restrain treatment if weevil activity is detected earlier. We see cotton in corn, sorghum and sugar cane, it can be reported that the area does not meet the requirements and fees may be levied according to TDA regulations.
Sorghum looks very pure with lots of sorghum in the hard test stage. This week during varietal testing we noticed a significant decrease in the amount of sugar cane aphids on the plots. Elsewhere throughout the valley, when we explored, we noticed that the amount of sugar aphids in sugar cane is almost completely absent as the sorghum continues to ripen.
We saw a few midges, but nothing on the doorstep. Any flowering sorghum should be inspected from now on as we continue to monitor sorghum as there have been reports of fly spraying. We beat the sorghum in the soft dough stage and there is still no significant amount of head worm.
We accidentally studied a very young sorghum in the early stages of the growing season and noticed significant pressure of falling army worms in some colonies.
https://agfax.com/2022/06/06/texas-lrgv-cotton-chilli-thrips-and-fleahoppers/ Chile TRIPS and flea – AgFax