EFFICACY OF CERTAIN ACARICIDES AGAINSTTEGOLOPHUS GUAVAE AND BREVIPALPUS PHOENICIS ON GUAVA TREES

Abstract

In the recent years Guava trees were infested with the rust mite Tegolophus guavae (Boczek) and Tenuipalpid mite Brevipalpus phoenicis (Geijskes) El-Halawany and Abou-Setta (2014). Inspection of guava trees showed that the population abundance of phytophagous mite, T. guavae was high on leaves and B. phoenicis was high on leaves and fruits. The present investigations were carried out to evaluate eight acaricides, (Agromic, Deva, Berfect, Nest, Baroq, Koncor, Menova and Ortus) against T. guavae and B. phoenicis under field conditions. Results indicated that Ortus, Menova, Agromic and Baroq were the most effective compounds in reducing guava rust mite population, T. guavae followed by Deva, Berfect and Koncor which gave good reduction over (86.0%), while Nest was the lowest (72% mortality). The reduction percentage of B. phoenicis after three weeks of application was 84% mortality, the highest reduction was recorded for Ortus 5% (90%) on leaves and fruits. INTRODUCTION The guava rust mite T. guavae was recorded for the first time in Egypt on Psidium guajava L. by El-Halawany (2012) at Qalubia Governorate. After that ecological studies were done studied by (El-Halawany & Abou-Setta, 2014). on guava indicated that T. guavae inhabiting leaves in February then increased in the number and reach maximum number in June and October especially on young leaves. On the other hand, the Tenuipalpid mite B. phoenicis inhabiting leaves in march and infested fruit after fruit setting and increased in the number in July on leaves and June on fruit causes brown-reddish. In Florida, USA, the mite T. guavae and Brevipalpus spp., cause damage to fruits and tender leaves (Pena et al., 1999). Highest numbers of T. guavae are observed in early autumn, winter and spring months. The mites are most often observed on fruit, causing deformations. The tenuipalpid mite, Brevipalpus phoenicis (Geijskes) is an important pest of more than 50 genera of ornamental plants, it's evidently well distributed throughout the world, this mite transmit virus leprosies when population are high (Jeppson et al., 1975), also Zaher (1984) found B. phoenicis is a principal of citrus, other hosts include guava, quince, sweet potato and acalypha, prefere the lower surfaces of leaves around the midrib and main veins, they were found also in pits, pedical and floral apex of fruits. EFFICACY OF CERTAIN ACARICIDES AGAINST TEGOLOPHUS GUAVAE AND BREVIPALPUS PHOENICIS ON GUAVA TREES 1460 Many researchers studied the effect of some acaricides against phytophagous mites. Rezk (1998) evaluated the two acaricides, Ortus (fenpyroximate) and Neoron (bromopropylate), on Brevipalpus obovatus on citrus orchards in Egypt. On fig trees, abamectin showed a promising control against Tetranychus urticae, Rhyncophytoptus ficifoliae and Aceria ficus it caused reduction of 85%, 75% and 68% in population, respectively (Abou-Awad et al., 2000). (Abou-Awad et al., (2005) showed the effect of abamectin on eriophyid olive mites, the results indicate that abamectin gave reduction of 85.40 % and 88.90 % in the population of Aceria oleae and Tegolophus hassani on leaves, respectively, during the 35-day period following applications. Similar results of abamectin biocide against eriophyid mites were found on citrus in Florida (Childers, 1986). Tayyib et al. (2005) in Pakistan evaluated new insecticides for controlling T. urticae on cotton. The chlorfenapyr gave highest mortality (87.5%), also fenpyroximate gave (63.75%), while the dicofol and azocyclotin gave less than 50% mortality. AL-Joboory and AL-Jorany (2011) found that the efficacy some Acaricides (Envidor 240 SC, Ortus 5% SC, Bye Bye 20 EC, King bow 24 ES and Abamectin 1.8% EC) were a high sufficiency in controlling the mites and gave longer protection duration for the plants. Al-Azzazy et al. (2013) indicated that the Abamectin was superior in reducing Aceria tulipae (79% reduction) after 28 days. This study aims to evaluate of certain acaricides for controlling T. guavae and B. phoenicis on Guava trees in Qalubia governorate.