Inform of the System of Alarm of Plagues

Source: INTA

The rains accompanied and they favored the siembra for the thick crop. And that was reflected in the report on plagues.

The current situation favors the recovery of cultivations damaged by cutting caterpillars in numerous towns of the center of Córdoba, where they register very intense attacks that diminish the stand of plants in cultivations of corn, sunflower and soya. They also register numerous plagues of recent appearance associated to lots of many years of cultivations managed low direct siembra. In those lots different control alternatives are applying to avoid the decrease of the stand of plants, fundamental factor that makes to the achievement of the potential yields of each cultivation.

Cutting caterpillars (Agrotis malefida) (Porosagrotis gypaetina)

They register very severe attacks of this plague in towns located in the center of the county of Córdobba (I Laugh Room, Oncativo, The France, First and other River). This attack had already been predicted in previous reports in function of adults' population's data obtained by the Ability of Agronomy of the National University of Córdoba.

The suggested answers

In function of the high levels of registered attacks, of up to 20-30 larvas/m2, difficulties have been observed for an effective control of the plague, since the same one presents an advanced state of larval development, with the potential maximum of damage and of tolerance to the plaguicidas used for their control. In these cases he/she seeks advice the use of insecticide fosforados in mixture with insecticide piretroides. The situation outlined in the center of Córdoba. It is different to local level (AND of Córdoba), where they register moderate attacks of up to 2-3 larvas/m2 and although they can damage significantly to the cultivation, their control can be made with reduced dose of insecticides.

I sprout Underground (Anurogryllus muticus)

This insect has increased his populations in the present campaign at alarming levels in numerous lots dedicated to the siembra of soya and other summer cultivations. At the moment the plague is presented in state of advanced development and its evaluation in field it should be made in similar form to the suitable ones for the evaluation of white worms, making floor samplings to 25-30 cm of depth. This insect can cut young plants of sunflower and soya mainly and, in smaller measure, corn, to which you/they transport to underground galleries where they feed.

The suggested answers

The use of toxic baits for the control of this insect, recommended in previous reports, is a technique that for the difficulties of its implementation, it is not carrying out it. In the event of tall populations (5-10/m2) registered insecticides are using for tucuras control in maximum dose in night application to achieve the maximum direct contact with the plague.

Bug Pellet (Isopoda)

Isolated attacks are presented but of different intensity of this crustacean, important sunflower enemy and soya in emergency stage. At the moment, in function of the high levels of humidity, the plague has a smaller impact of which you/they can cause since to the plántulas in emergency they can feed of vegetable remains in decomposition.

The suggested answers

It is suggested to make previous evaluations to the siembra to determine the infestación grade. This will allow to be alert in case damages are observed to the plántulas. To vegetable garden level and garden they are registered several plaguicidas for their control. These products have a very high cost for their use in extensive cultivations, I motivate for which you/they are using for the control of this plague insecticides fosforados in similar dose to those used for the tucuras control.

Tucuras

At local level reduced population of small nymphs of the gender Dichroplus is observed (stadiums ninfales). he/she is considered that in the west of the county of Córdoba the development of these insects is more advanced, reason why it is possible its evaluation. The mentioned species present two generaciones/año, while those that begin their birth in November only develop an annual one

The suggested answers

The good registered climatic conditions during October and the first floor registered population level in the last autumn point out that low probability of intense attacks exists. Anyway it is convenient to make monitoreo of the plague during November and principles of December in lots I lower direct siembra and in roads and banquinas that are sources of infestación of the plague toward the neighboring lots. These insects present an important potential of damage under conditions of drought to sunflower cultivations, soya and late corn. The list of insecticides registered figure in reports of the previous year.

Dribbly

Attacks of these mollusks have been presented in lots isolated in several towns of the AND of Córdoba. These organisms are associated to the stubble presence in surface and discharges conditions of humidity. The cultivations of soya and sunflower can be very affected by the populations of this plague.

The suggested answers

As it has already been commented in previous reports, the control of dribbly you can make with Goal Acetaldehído that used in liquid formulation to 20% it has offered good results in dose of two liters for hectare in total covering in night application. It is also registered a granulated bait with the help of the one mentioned active principle (Clartex 5%), which gives excellent results with 4 kg of product for there is. Treatments with this product made in the area of Bell Ville offered a near control to 90% in lots infested with levels of 10/15 babosas/m2.

Weevils of the medic

These insects cause severe damages to the agricultural cultivations and forrajeros as much in mature state as of larva. The adults are particularly harmful to the sunflower plántulas, to those that cause damages in cotyledons and neck. The larvas damage at underground level to great diversity of cultivations like medic and sunflower plántulas and soya.

The suggested answers

The control of adults of weevils in sunflower you can make with diverse insecticides although it should become special care to the quality of the application to reduce in important form the level of damages. Regarding the damage caused by larvas, the same one can be made in cultivation low direct siembra by means of the use of insecticides granulated in the moment of the siembra, while for the control of the plague in search emergency doesn't prepare of technical of control. Another alternative, even not evaluated, to reduce the incidence of these larvas, it is the use of seed terápicos in soya and sunflower.

Barrenador of the Cane (Diatraea saccharalis)

During the month of October the emergency of adults of this species began with different levels according to towns. In the area of Blind Deer they registered population's picks by the middle of October with picks of 80-90/noche. In Marcos Juárez registered a pick of 250/noche the 26/10, being at the moment the picks of 10-50/noche.

How to control the situation

It is suggested to make evaluations of cultivations of corn of first siembra time (September), mainly in the county of Santa Faith (in Córdoba the cultivations arrived a backwardness of 3-4 weeks in siembra time). it is remembered that the threshold of treatment of this plague is based on the presence of adults and in a level of 20-25 of plants with postures.

Caterpillar of the Medic (Colias lesbia)

The medic cultivations present the threat of attack of cutting caterpillars and weevils, reason why their evaluation is recommended. Regarding plant lice and caterpillars defoliadoras, population of importance is not observed.

How to control the situation

The populations of the caterpillar of the medic present in very low densities in the whole region (1 larva / 1 or 2 net blows) they present a high grade of provoked parasitism for larvas of the wasp Cotesia sp (Apanteles). inside each caterpillar they can be observed from 10 to 15 larvas of the wasp, those that destroy the guest after reaching their maximum size and they knit buds of silk of golden color that can be observed in form of clusters on the leaves of the medic.