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30 September 2019 First Report of Caulotops distanti Reuter (Hemiptera: Miridae: Bryocorinae) Feeding on Two Species of Mezcal Agave (Asparagaceae) in Guerrero, Mexico
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Abstract

An agave bug Caulotops distanti Reuter (Hemiptera: Miridae) is considered a potential pest of agaves in Guerrero, Mexico. Specimens were collected on the leaves of mezcal agave (Agave vivipara L., and Agave cupreata Trel & Berger) (Asparagaceae) in plantations in Quetzalapa, Huitzuco de los Figueroa, Guerrero, Mexico. This is the first report C. distanti attacking Agave cupreata and A. vivipara. Observations on damage and feeding symptoms of this plant bugs are presented.

Mexico is a faunistically rich country with a great diversity of Asparagaceae (= Agavaceae), including a high number of endemic species (Espejo 2012). Many species of the genus Agave are particularly valuable ecologically and economically, some of them with a long tradition of cultivation (Granados 1993; García-Moya et al. 2011). In the state of Guerrero, 2 mezcal agave species are especially important economically: “espadín” (Agave vivipara L.) and “papalote” (Agave cupreata Trel. & Berger), which are used for producing mezcal, an important distilled Mexican drink (Barrios et al. 2006).

The agave weevil, Scyphophorus acupunctatus Gyllehanl (Coleoptera: Dryophthoridae), is the primary insect pest associated with A. vivipara and A. cupreata in Guerrero (Barrios et al. 2006), where its damage is most significant in mature plantations. Agave species used for production of mezcal are perennial crops, requiring more than 5 yr of cultivation before they are harvested (Núñez et al. 2011). This long period of cultivation allows for the potential development of several insect pests.

During a long-term survey of the insects associated with mezcal agaves in Guerrero, an unknown plant bug (Miridae) came to our attention. This species was observed on young to medium-aged Agave angustifolia Haw. (Asparagaceae) and A. cupreata plants (1–4 yr old), where it caused severe chlorosis: numerous small, irregular, yellowish spots (Fig. 1A, B) clearly visible on the leaves.

Similar damage was previously observed on agave in Jalisco. González-Hernández et al. (2007) and Pérez-Domínguez & Rubio-Cortés (2007) reported Caulotops agavis Reuter (Hemiptera: Miridae) damaging blue agave (Agave tequilana F.A.C. Weber; Asparagaceae) and González-Castillo et al. (2011) observed a Caulotops sp. feeding on Agave duranguensis Gentry (Asparagaceae).

With the objective to determine the correct taxonomic status of this plant bug, we established a survey to sample Agave plantations and nurseries in Guerrero. Adults were collected with an aspirator, killed, and preserved in 70% ethyl alcohol, point mounted, and identified by Harry Brailovsky (Instituto de Biología, Universidad Nacional Autónoma de México) and Thomas J. Henry (Systematic Entomology Laboratory, USDA-ARS). All specimens were determined as Caulotops distanti Reuter (Hemiptera: Miridae: Bryocorinae) (Fig. 2). Caulotops distanti is a Neotropical species with a wide distribution, from Costa Rica, Mexico, and Venezuela (Henry 1985). In the US, it is considered an invasive species in Texas on Yucca (Asparagaceae) plants, and in Florida it is associated with imported potted plants of Yucca gigantea Lem. (= Yucca elephantipes Regel ex Trel.) (Asparagaceae) (Henry 1985). Carvalho (1948) gave the first Mexican report of this plant bug (as Caulotops rufoscutellatus major Carvalho) based on specimens from Yucatan.

Material examined. MÉXICO. Guerrero. During field surveys for pests on agave annually from 2013 to 2017, C. distanti was observed in some mezcal agave plantations in Guerrero. It was detected in 2 plantations of papalote mezcal agave (A. cupreata Trel. & Berger) located in Xochipala (17.754301°N, 99.713319°W; 1,911 masl) and in Quetzalapa (18.355608°N, 99.181216°W; 957 masl). It also was detected in 4 plantations of espadín mezcal agave (A. angustifolia Haw.) in “La Minilla” (18.355906°N, 99.181400°W; 962 masl), “El Rancho frio” (18.388102°N, 99.169001°W; 1,114 masl), “El Llano” (18.379902°N, 99.154601°W; 1,155 masl), and “El Horno” (18.390106°N, 99.160403°W; 1,140 masl) located in Quetzalapa, Municipality of Huitzuco de los Figueroa, Guerrero. We collected (18–20 Mar; 5–7, 13–15 Apr, and 6 Jun 2015) adult bugs on mezcal agave espadín (A. angustifolia Haw.) and mezcal agave papalote (A. cupreata Trel. & Berger) in plantations in “La Minilla”, “El Llano,” and “El Horno.” Additional specimens also were detected in a nursery (18.339303°N, 99.185136°W; 913 masl) in Quetzalapa, Guerrero. Voucher specimens from this study have been deposited in Departamento de Zoología, Instituto de Biología, Universidad Nacional Autónoma de México, Ciudad de México, Mexico and the Smithsonian Institution, National Museum of Natural History, Washington, DC, USA.

Fig. 2.

Adult male of Caulotops distanti Reuter dorsal (A), lateral (B), and ventral view (C).

img-AAua_642.jpg

Currently, 8 species of Caulotops are known, 5 of which occur in Mexico, including C. distanti (Schuh 2002–2013). Cautolops distanti can be distinguished from other known species of the genus by the following combination of characters (Henry 1985): body length 4.1 mm or less, first antennal segment pale with apex and sub-basal ring fuscous, and central area of corium usually with yellow or orange wedge-shaped streak. In the field, this species may be found on heart leaves and the basal parts of leaves, generally feeding in the afternoon (between 7:00 P.M. and 9:00 P.M.; sunset at 7:00 P.M.). Most of the feeding occurs on the upper surface (adaxial) of the leaf, but some specimens also feed on the lower leaf surface (abaxial).

At this time, the impact of damage by C. distanti does not appear serious on mezcal agaves “espadín” and “papalote” in Guerrero, but it is important to implement additional studies to determine its behavior, habits, population dynamics, distribution, and to further evaluate the magnitude of damage caused by this plant bug on wild and cultivated agaves. Although it is possible that C. distanti could transmit plant pathogens or toxins that might affect agave, Wheeler (2001) documented that Miridae are poor disease vectors.

We extend our thanks to Daniel Castro Rodríguez and Luis Figueroa Ocampo (producers of mezcal maguey) for access to their maguey plantations in Quetzalapa, Guerrero, and to Jorge M. Valdes-Carrasco (Colegio de Postgraduados) for some of the images used in this paper. We also thank Consejo Nacional de Ciencia y Tecnología (CONACYT) for providing a Postdoctoral scholarship for the first author at the Facultad de Ciencias Agropecuarias, Universidad Autónoma del Estado de Morelos.

Fig. 1.

Damage caused by adults of Caulotops distanti Reuter on leaves of Agave cupreata Trel. & Berger (A), and Agave vivipara L. (B).

img-z3-2_642.jpg

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Pedro Figueroa-Castro, Víctor López-Martínez, Thomas J. Henry, Harry Brailovsky, and Artemio Hernández-Ruiz "First Report of Caulotops distanti Reuter (Hemiptera: Miridae: Bryocorinae) Feeding on Two Species of Mezcal Agave (Asparagaceae) in Guerrero, Mexico," Florida Entomologist 102(3), 642-644, (30 September 2019). https://doi.org/10.1653/024.102.0314
Published: 30 September 2019
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